Make few check more explicit

Author: IvanGoncharov

src/index.js

@@ -357,11 +357,15 @@ function graphqlHTTP(options: Options): Middleware {
  // Note: Information about the error itself will still be contained in
  // the resulting JSON payload.
  // https://graphql.github.io/graphql-spec/#sec-Data
- if (response.statusCode === 200 && result && !result.data) {
+ if (
+ response.statusCode === 200 &&
+ result != null &&
+ result.data == null
+ ) {
  response.statusCode = 500;
  }
  // Format any encountered errors.
- if (result && result.errors) {
+ if (result?.errors) {
  (result: any).errors = result.errors.map(formatErrorFn);
  }
 
@@ -443,7 +447,8 @@ export type GraphQLParams = {|
 module.exports.getGraphQLParams = getGraphQLParams;
 async function getGraphQLParams(request: $Request): Promise<GraphQLParams> {
  const bodyData = await parseBody(request);
- const urlData = (request.url && url.parse(request.url, true).query) || {};
+ const urlData =
+ (request.url != null && url.parse(request.url, true).query) || {};
 
  return parseGraphQLParams(urlData, bodyData);
 }