Describe the bug
Altair does not render the response JSON nicely when a GraphQL response comes with a non-200 http status code.

To Reproduce
Steps to reproduce the behavior:

1. Send a request to any GraphQL API that would return a non-200 http code for that request.
2. The response JSON will be rendered as a string on the right pane.

Expected behavior
The response JSON should be rendered exactly like it is done for 200 responses.

Screenshots

Desktop (please complete the following information):

• OS: Windows
• Platform: Desktop app
• Version: 5.0.24

It would be nice if the error JSON was also rendered as a JSON and not as a string. It would let the users of the API to understand the error more easily.