Improve template for optional Auth

[elnipa]

According to OpenAPI Spec single endpoints can have optional auth:
https://spec.openapis.org/oas/v3.1.0#optional-oauth2-security

In our case by defining

  security:
    - {}
    - bearerAuth: []

In this case the endpoint template should have some indication that auth is optional. Currently it's still marked as "required" and the options for Auth show an empty string for No Auth.

[elnipa]

Example how this is rendered in ReDoc

[mrin9]

thanks for reporting ... will fix it soon