SwaggerUI doesn't render response bodies for non-200 responses

[glowcloud]

Describe the bug you're encountering

When using try it out for an endpoint that returns a response with non-200 status code, the response body is not rendered.

To reproduce...

Steps to reproduce the behavior:

1. Start a server that would return response with a body and 400 status code for a certain endpoint
2. Open Swagger Editor
3. Add a spec for this server
4. Send a request to the endpoint returning 400 response
5. See error

Expected behavior

Renders a response body as it would for responses with 2XX status codes

[char0n]

Addressed in #9555