Describe the bug
If multiple required fields are omitted from the request body, only the first is reported missing in the error message.

To Reproduce
Make an empty object PUT request to /pet with this defintion

paths: /pet: put: tags: - pet summary: Update an existing pet description: Update an existing pet by Id operationId: updatePet requestBody: description: Update an existent pet in the store content: application/json: schema: required: - name - color type: object properties: name: type: string example: doggie color: type: string example: brown 

Actual behavior
Error: must have required property 'name'

Expected behavior
Errors: must have required property 'name' and must have required property 'color'