Fix bug related to Azure OpenAI
model streaming response
#932
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Solves: #797
This PR fixes an issue happening with Azure OpenAI streaming Response causing the raise of an AttributeError
As stated on the issue, the error occurs in pydantic-ai's OpenAI model implementation where it assumes every delta in the streaming response contains a content field. However, with Azure OpenAI's API, some deltas (like role initialization) may not include content, resulting in choice.delta.content being None.