errors rendering non-existing schemas when defaultModelRendering is set to model

[glowcloud]

Content & configuration

Example Swagger/OpenAPI definition:

openapi: 3.1.0
info:
  title: Empty response test case
  version: '1'
paths:
  '/':
    get:
      responses:
        '200':
          description: no content
        '201':
          description: no schema but an example
          content:
            application/json:
              example:
                foo: bar
        '202':
          description: no schema but examples
          content:
            application/json:
              examples:
                first:
                  value:
                    foo: bar
                second:
                  value:
                    baz: foobar
        '203':
          description: no schema no example
          content:
            application/json: {}

Swagger-UI configuration options:

SwaggerUI({
    url: "./examples/oas31-empty-response.yaml",
    dom_id: "#swagger-ui",
    presets: [
      SwaggerUIBundle.presets.apis,
      SwaggerUIStandalonePreset
    ],
    defaultModelRendering: "model",
    plugins: [
      SwaggerUIBundle.plugins.DownloadUrl
    ],
    layout: "StandaloneLayout"
})

Describe the bug you're encountering

Swagger UI tries to render schemas when no schema has been provided, if defaultModelRendering is set to model. This causes errors:

and renders the Could not render ModelWrapper message:

If we switch to the example tab, we will correctly not be able to switch back to schema:

To reproduce...

Steps to reproduce the behavior:

1. Load the provided specification with defaultModelRendering set to model
2. Expand the GET / operation
3. See the Could not render ModelWrapper message and errors in console

Expected behavior

Swagger UI should not render the schema tab if no schema has been provided.

[char0n]

So this is related to the fact that we're trying to render (forcing with configuration) a component that it's not event accessible from standard UI workflow.

Sensible thing to do would be ignoring defaultModelRendering=model when there is no schema.

[glowcloud]

Addressed by #9667

[char0n]

Released in https://github.com/swagger-api/swagger-ui/releases/tag/v5.11.10