Query with example turns field into required

[massada]

Q&A (please complete the following information)

• OS: macOS
• Browser: chrome, safari
• Version: chrome 88.0.4324.192, safari 14.0.3 (16610.4.3.1.4)
• Method of installation: Swashbuckle.AspNetCore
• Swagger-UI version: 3.42.0
• Swagger/OpenAPI version: OpenAPI 3.0

Content & configuration

Example Swagger/OpenAPI definition:

openapi: 3.0.1
info:
  title: example
  version: v1
paths:
  /example:
    get:
      parameters:
        - name: page
          in: query
          description: Page number
          schema:
            type: integer
            format: int32
          example: 1
      responses:
        '200':
          description: OK

Describe the bug you're encountering

When a query param has the example set, if we try to remove the value to send an empty query string, validation fails like the field is required.

To reproduce...

Steps to reproduce the behavior:

1. Go to query filed
2. Remove the value
3. Click Execute
4. See error

Expected behavior

When example is set the query field must not be required.

Screenshots

Additional context or thoughts