Empty ErrorContent object

[c-t-fallon]

I have a use case where I am pushing the limit of the context window with the amount of data I have. I noticed the stream dropping for seemingly no reason, an ErrorContent object was coming back, but with no data. I inspected the HTTP request and found the context window exceeded error. I would have expected this data to be in the ErrorContent object.

https://github.com/[c-t-fallon/ErrorResponseDemo](https://github.com/c-t-fallon/ErrorResponseDemo)

[stephentoub]

This appears to be an issue where the OpenAI service is sending back the error differently than it's documented. The OpenAI library is trying to read the properties according to how it's documented, and is getting back null content. I've opened openai/openai-dotnet#849.