It's possible for the cache response cache to have null values

[rawsh-rubrik]

See TypeError: unsupported operand type(s) for +=: 'NoneType' and 'str' when writing graph

Not sure exactly how to reproduce, flaky behavior when using large corpus with azure openai.

[gusye1234]

Yeah, I kinda know why.
Maybe the azure openai chat complete will return null, so nano-graphrag will cache this return.
Do you know in which case azure openai will have such behavior? Maybe I can think of a work round to avoid this.

[rawsh-rubrik]

Not sure what cases, seemed to happen a few thousand requests in