Azure OpenAI: 'NoneType' object has no attribute 'tool_calls'

[maik-parloa]

The OpenAI plugin currently leads to issues when using Azure OpenAI with content filtering active. The issue seems to be related to langgenius/dify#5790

The following exception is triggered reproducibly:

AttributeError: 'NoneType' object has no attribute 'tool_calls'

I tested working around by adopting the Dify patch (effectively return None conditionally) and it seems to resolve the limitation:

    def _parse_choice(self, choice: Choice) -> llm.ChatChunk | None:
        delta = choice.delta

        if delta is None:
            return None