Bug: OnPostChatPromptAsync doesn't create an async yield array for internal back-end exceptions

[Coruscate5]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [X] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

Exceed the context window, or manually throw an exception in OnPostChatPromptAsync, or cause any other OpenAI API call failure - the response generation never completes, because this action does not create an async enumerable that can be ingested by front-end

Any log messages given by the failure

Expected/desired behavior

Displays API call error to user. Fix: Migrate the side-effect to a try-catch block (openai.GetChatStreamingCompletions), then use a bool flag to either return an Error based ChunkResponse ("Error: ex.Tostring") or the actual completed Response.

OS and Version?

Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

Versions

Mention any other details that might be useful

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[elbruno]

Fixed on the latest version.