fix: Use optional chain when access to block map entity

[ysak-y]

What

Use optional chain to access to the entity of BlockMap in groupBlockContent method.

Why

First of all, thank you for your library. I'm a beginner with react-notion. When I try to render a Notion page with the ID 2e22de6b770e4166be301490f6ffd420, which is shown as a sample page in notion-api-worker, then met error as below.
https://github.com/splitbee/notion-api-worker?tab=readme-ov-file#load-page-data

 Creating an optimized production build ..TypeError: Cannot read properties of undefined (reading 'content') at /Users/yoshiakiyamada/work/sample-repo/apps/client/node_modules/react-notion/dist/react-notion.cjs.production.min.js:1:1746 at Array.forEach (<anonymous>) at /Users/yoshiakiyamada/work/sample-repo/apps/client/node_modules/react-notion/dist/react-notion.cjs.production.min.js:1:1698 at s (/Users/yoshiakiyamada/work/sample-repo/apps/client/node_modules/react-notion/dist/react-notion.cjs.production.min.js:1:1933) at N (/Users/yoshiakiyamada/work/sample-repo/apps/client/node_modules/react-notion/dist/react-notion.cjs.production.min.js:1:7210) at g (/Users/yoshiakiyamada/work/sample-repo/apps/client/node_modules/react-notion/dist/react-notion.cjs.production.min.js:1:11725) at Wc (/Users/yoshiakiyamada/work/sample-repo/apps/client/node_modules/react-dom/cjs/react-dom-server.browser.production.min.js:68:44) at Zc (/Users/yoshiakiyamada/work/sample-repo/apps/client/node_modules/react-dom/cjs/react-dom-server.browser.production.min.js:70:253) at Z (/Users/yoshiakiyamada/work/sample-repo/apps/client/node_modules/react-dom/cjs/react-dom-server.browser.production.min.js:76:89) at Zc (/Users/yoshiakiyamada/work/sample-repo/apps/client/node_modules/react-dom/cjs/react-dom-server.browser.production.min.js:70:481) 

I investigated why it occurs and noticed there is the block that has no value property like { "role": "none" }. You can see it in below section.

curl results of https://notion-api.splitbee.io/v1/page/2e22de6b770e4166be301490f6ffd420

 {	"2e22de6b-770e-4166-be30-1490f6ffd420": {	"value": {	"id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"version": 525,	"type": "page",	"properties": { "title": [["react-notion", [["b"]]]] },	"content": [	"10c9bd60-abed-457c-80f1-2425d6e21522",	"31e31b01-1941-426e-a26f-2d5e96a3e0ef",	"8490bd36-13b2-4bcf-83ac-347e89c612fa",	"e840e07f-4f6e-4957-807f-a4486ad05b77",	"3d6c7825-e6fa-40a5-b746-4f2d6e3f0807",	"0918576e-2d27-40a7-bae0-389bd2755a6d",	"448e5003-feb3-443f-b9d7-4529bacfdd98",	"f247b3fe-6e5c-45cb-be59-60fe98a5a3c5",	"465a80f6-ee41-4594-8f3d-0e954f37a329",	"7b896b03-98c4-41cb-aaa4-e1699504cdc1",	"aa4cc01e-6051-4000-b420-daf18b3fc78e",	"426736d7-0584-48b5-bde3-e6fa9c42dc04",	"a5606804-60ab-40be-ac16-b62e849cd865",	"2e7fda26-9c38-4a86-8947-ecdce8ee8ac6",	"efddf43c-32b2-4835-b8b4-77ee308d6338",	"b129dc91-968b-4e6f-9c70-cb09a1078171",	"4bbc6793-6728-4bd3-84c9-c544ed77363b",	"eb08b214-0ee7-40eb-9a30-8cbc0c303eda",	"9b6050e5-00fd-4af7-b106-5c2d0bf66fbf",	"77135bf3-fa11-4c19-8397-69ee133ca1ce",	"cfee83d5-3030-4b32-b2a9-dc174600abef",	"ffdc6fe9-a0c1-41a1-a44c-64baf889c9a6",	"db39542f-cf18-4679-9874-fa281dc90a4d",	"ed47f303-a49d-4b73-a79a-b579a967ccff",	"7d23e1e0-e2d8-4770-b29f-a44e2acc8da2",	"001a3d85-1d98-4708-a23b-bf56f138a9cb",	"58e8b9e1-3b20-4e40-bf1f-9de85153de24",	"7dbefaf4-3bb3-4e00-9a7c-3785cbbcfcc8",	"bdc89b35-4ff0-4eac-a01c-7e3c9cb59980",	"e42e658d-2b8e-4265-8fa1-2a0807a87952",	"8ee78741-d191-4a00-9227-5979b3498d24",	"7b4a31bc-76bf-4243-812a-e09a51bd2c2c",	"278d40df-89ec-46aa-813c-fa7439840ac4",	"6c4b0669-5ea3-4ca0-bd01-1f407e4d7474",	"11d8e225-a0dd-4eb2-9d2a-052ab47e0beb",	"f1f9ea36-1638-43c8-9173-9cfc2024ba6c",	"77f5e257-09f2-4770-8236-268ab693f31a",	"60e6b91e-c96e-4424-b96c-c8f095d4b8a2",	"86173527-f987-4ed5-bb90-a0e289890651",	"19bc18de-054c-400e-8991-c4f299822acf",	"d71afe59-86c7-4094-801c-6461c7b40baa",	"46adc853-f641-45b5-a20f-3221330e0f7e",	"a9ec04e9-db22-4381-b24f-a992d04051a5",	"6056518e-6e1a-44bc-a714-16a91248e102",	"af42b2ac-6c2d-43e9-ab14-169417e6173b",	"939e71ec-cf04-41e0-b4b3-c9cd2302ad0d",	"790a3daf-0f52-45c8-ae06-8a74dbb6b227",	"1a854c41-c86f-48de-828b-98e0163de611",	"a523933e-2755-4677-bd00-17f8e35fda03",	"0651e237-24e8-4476-a00b-a1e0afe2000c",	"c866b3c4-c478-4dcc-97b4-0a831d58abfe",	"0a32f372-d420-4b32-8de8-a37d02430ce0"	],	"format": {	"page_cover": "https://s3-us-west-2.amazonaws.com/secure.notion-static.com/b017527e-5dcc-44c5-afff-fc5280a5226c/react-notion-bg.png",	"page_cover_position": 0.5	},	"permissions": [	{ "role": "reader", "type": "public_permission" },	{ "role": "editor", "type": "space_permission" }	],	"created_time": 1587405360000,	"last_edited_time": 1614072000000,	"parent_id": "b5276213-3d36-4d38-adc7-93cf017f36b7",	"parent_table": "block",	"alive": true,	"file_ids": [	"200fff77-2605-4252-8f4e-fd8c18d91b69",	"c5cc76e3-3fb4-44b6-aaa2-3671599e916f",	"b017527e-5dcc-44c5-afff-fc5280a5226c"	],	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"b5276213-3d36-4d38-adc7-93cf017f36b7": { "role": "none" },	"10c9bd60-abed-457c-80f1-2425d6e21522": {	"value": {	"id": "10c9bd60-abed-457c-80f1-2425d6e21522",	"version": 56,	"type": "text",	"properties": {	"title": [	["A"],	[" React renderer for Notion pages", [["b"]]],	[". Use Notion as CMS for your blog, documentation or personal site."]	]	},	"created_time": 1587410640000,	"last_edited_time": 1608819900000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"31e31b01-1941-426e-a26f-2d5e96a3e0ef": {	"value": {	"id": "31e31b01-1941-426e-a26f-2d5e96a3e0ef",	"version": 24,	"type": "text",	"created_time": 1608819900000,	"last_edited_time": 1608819900000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"8490bd36-13b2-4bcf-83ac-347e89c612fa": {	"value": {	"id": "8490bd36-13b2-4bcf-83ac-347e89c612fa",	"version": 128,	"type": "text",	"properties": {	"title": [	["This page was rendered by "],	["react-notion", [["c"], ["a", "https://github.com/splitbee/react-notion"]]],	[" & was developed by "],	["Splitbee", [["a", "https://splitbee.io"]]],	[". Splitbee is an easy to use analytics and conversion tool for any team."]	]	},	"format": {	"copied_from_pointer": {	"id": "2e15b932-b9bd-460e-8ca4-60950912b1d2",	"table": "block",	"spaceId": "733a82c1-3e5b-4df0-b66d-79919f319360"	}	},	"created_time": 1608819954933,	"last_edited_time": 1608820140000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"copied_from": "2e15b932-b9bd-460e-8ca4-60950912b1d2",	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"e840e07f-4f6e-4957-807f-a4486ad05b77": {	"value": {	"id": "e840e07f-4f6e-4957-807f-a4486ad05b77",	"version": 16,	"type": "text",	"created_time": 1610013960000,	"last_edited_time": 1610013960000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"3d6c7825-e6fa-40a5-b746-4f2d6e3f0807": {	"value": {	"id": "3d6c7825-e6fa-40a5-b746-4f2d6e3f0807",	"version": 67,	"type": "sub_sub_header",	"properties": { "title": [["Getting Started"]] },	"created_time": 1610014029403,	"last_edited_time": 1610014020000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"0918576e-2d27-40a7-bae0-389bd2755a6d": {	"value": {	"id": "0918576e-2d27-40a7-bae0-389bd2755a6d",	"version": 189,	"type": "text",	"properties": {	"title": [	["Install the "],	["react-notion", [["c"]]],	[" package using npm or yarn\n\nCheck our repository to learn how to use react-notion \n"],	["https://github.com/splitbee/react-notion", [["a", "https://github.com/splitbee/react-notion"]]]	]	},	"created_time": 1610014140000,	"last_edited_time": 1610015880000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"448e5003-feb3-443f-b9d7-4529bacfdd98": {	"value": {	"id": "448e5003-feb3-443f-b9d7-4529bacfdd98",	"version": 9,	"type": "text",	"created_time": 1610015880000,	"last_edited_time": 1610015880000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"f247b3fe-6e5c-45cb-be59-60fe98a5a3c5": {	"value": {	"id": "f247b3fe-6e5c-45cb-be59-60fe98a5a3c5",	"version": 28,	"type": "sub_sub_header",	"properties": { "title": [["Tutorials & Starters"]] },	"created_time": 1610014043639,	"last_edited_time": 1610014080000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"465a80f6-ee41-4594-8f3d-0e954f37a329": {	"value": {	"id": "465a80f6-ee41-4594-8f3d-0e954f37a329",	"version": 48,	"type": "bulleted_list",	"properties": {	"title": [	["Use Notion as CMS for your Blog", [["a", "https://splitbee.io/blog/notion-as-cms-using-nextjs"]]]	]	},	"created_time": 1610014020000,	"last_edited_time": 1610014080000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"7b896b03-98c4-41cb-aaa4-e1699504cdc1": {	"value": {	"id": "7b896b03-98c4-41cb-aaa4-e1699504cdc1",	"version": 63,	"type": "bulleted_list",	"properties": {	"title": [	["Notion Blog starter using Next.js", [["a", "https://github.com/splitbee/react-notion-blog"]]]	]	},	"created_time": 1610014080000,	"last_edited_time": 1610014080000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"aa4cc01e-6051-4000-b420-daf18b3fc78e": {	"value": {	"id": "aa4cc01e-6051-4000-b420-daf18b3fc78e",	"version": 24,	"type": "text",	"created_time": 1610015880000,	"last_edited_time": 1610015880000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"426736d7-0584-48b5-bde3-e6fa9c42dc04": {	"value": {	"id": "426736d7-0584-48b5-bde3-e6fa9c42dc04",	"version": 20,	"type": "sub_sub_header",	"properties": { "title": [["Features"]] },	"created_time": 1610015929853,	"last_edited_time": 1610015880000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"a5606804-60ab-40be-ac16-b62e849cd865": {	"value": {	"id": "a5606804-60ab-40be-ac16-b62e849cd865",	"version": 4,	"type": "text",	"properties": { "title": [["⚡️ "], ["Fast", [["b"]]], [" – Up to 10x faster than Notion *"]] },	"created_time": 1610015926692,	"last_edited_time": 1610015940000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"2e7fda26-9c38-4a86-8947-ecdce8ee8ac6": {	"value": {	"id": "2e7fda26-9c38-4a86-8947-ecdce8ee8ac6",	"version": 2,	"type": "text",	"properties": {	"title": [	["🎯"],	[" "],	["Accurate", [["b"]]],	[" – Results are "],	["almost", [["i"]]],	[" identical"]	]	},	"created_time": 1610015926692,	"last_edited_time": 1610015880000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"efddf43c-32b2-4835-b8b4-77ee308d6338": {	"value": {	"id": "efddf43c-32b2-4835-b8b4-77ee308d6338",	"version": 2,	"type": "text",	"properties": {	"title": [	["🔮"],	[" "],	["Code Highlighting", [["b"]]],	[" – Automatic code highlighting with "],	["prismjs", [["a", "https://prismjs.com/"]]]	]	},	"created_time": 1610015926693,	"last_edited_time": 1610015880000,	"parent_id": "2e22de6b-770e-4166-be30-1490f6ffd420",	"parent_table": "block",	"alive": true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"b129dc91-968b-4e6f-9c70-cb09a1078171": {	"value": {	"id": "b129dc91-968b-4e6f-9c70-cb09a1078171",	"version": 2,	"type": "text",	"properties": {	"title": [	["🎨"],	[" "],	["Custom Styles", [["b"]]],	[" – Styles are easily adaptable. 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true,	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	},	"20820346-3a3f-41e7-a4c6-062e28c91ccd": {	"value": {	"id": "20820346-3a3f-41e7-a4c6-062e28c91ccd",	"version": 2,	"type": "text",	"properties": { "title": [["This is hidden content 🤫"]] },	"format": {	"copied_from_pointer": {	"id": "308e46f2-30a5-4a63-bcf9-2e44c92766d4",	"table": "block",	"spaceId": "733a82c1-3e5b-4df0-b66d-79919f319360"	}	},	"created_time": 1590252492387,	"last_edited_time": 1590252492387,	"parent_id": "278d40df-89ec-46aa-813c-fa7439840ac4",	"parent_table": "block",	"alive": true,	"copied_from": "308e46f2-30a5-4a63-bcf9-2e44c92766d4",	"space_id": "733a82c1-3e5b-4df0-b66d-79919f319360"	},	"role": "reader"	} } 

So I want to ignore it when render them.

How

I met error when access to value property in block map because { "role": "none" } doesn't have it. So ignore it by adding optional chaining.