Regression: #4162 OAS3.0 parameter validation not working

[pho-enix]

OAS3.0 parameters are not validated and do not trigger errors.

Q	A
Bug or feature request?	Bug
Which Swagger/OpenAPI version?	OAS3.0
Which Swagger-UI version?	3.13.0
How did you install Swagger-UI?	npm swagger-ui-dist
Which browser & version?	firefox, chrome
Which operating system?	linux, windows

Demonstration API definition

    parameters:
    - name: mustbeset
      schema:
        type: string
      in: path
      required: true

Expected Behavior

1. Hit Try it out button
2. Leave the required parameter empty
3. Hit Execute
4. Required parameter gets highlighted red and gives users feedback that it's required

Current Behavior

Nothing happens in frontend. No user feedback

Hints

Schema Validation works (at least partial)
Error Feedback in Frontend Validation works (at least partial)
Probably the errors get lost somewhere in redux state

[lock]

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