fix(openai): handle missing text property on streamed completion

[hassiebp]

Important

Fixes default value in _extract_streamed_openai_response to prevent None from being appended to completion string in openai.py.

• Behavior:
  • Fixes default value in _extract_streamed_openai_response in openai.py by changing choice.get("text", None) to choice.get("text", "") to prevent None from being appended to completion string.

^{This description was created by for df9d180. It will automatically update as commits are pushed.}

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Greptile Summary

Disclaimer: Experimental PR review

This PR adds native environment support across the Langfuse Python SDK, enabling better organization and filtering of telemetry data.

• Added optional environment field to core data models (Trace, Observation, Score) with consistent validation rules
• Implemented environment parameter in client initialization with support for both constructor parameter and LANGFUSE_TRACING_ENVIRONMENT environment variable
• Added environment propagation through all integrations (LangChain, LlamaIndex, OpenAI)
• Added comprehensive test coverage for environment setting via constructor and environment variables
• Fixed a bug in OpenAI integration where empty text responses were handled incorrectly

[greptile-apps]

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