fix(open-9027): azure openai tracer fix for chunks

[shah-siddd]

Pull Request

Summary

Fixes tracer crashes when using trace_openai with streaming on Azure OpenAI. Handles (1) stream chunks with empty choices (e.g. heartbeats) and (2) empty or invalid function-call arguments so json.loads no longer raises.

Changes

• Empty choices: In openai_tracer.py, async_openai_tracer.py, and groq_tracer.py, streaming loops now use getattr(chunk, "choices", None) and skip chunks with no choices before accessing chunk.choices[0].delta, avoiding IndexError: list index out of range.
• Function-call arguments: In openai_tracer.py (parse_non_streaming_output_data), async_openai_tracer.py (streaming finally blocks), and groq_tracer.py (streaming + non-streaming), only call json.loads when the arguments string is non-empty and wrap in try/except for JSONDecodeError, avoiding "Expecting value: line 1 column 1 (char 0)" on empty/invalid JSON.

Context

Azure OpenAI can send stream chunks with empty choices (e.g. heartbeat chunks) and function-call arguments can be empty or incomplete. The tracer was assuming every chunk had choices[0] and that arguments were valid JSON, which caused "Failed yield chunk. list index out of range" and "Failed to trace… Expecting value: line 1 column 1 (char 0)" when implementing the openai-chatbot template with Azure + streaming.

Testing

• Unit tests
• Manual testing (Azure OpenAI streaming + openai-chatbot template)
• Postman CI/CD
• Other (please specify)

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