fix(langchain): mitigate missing run_id on_chain_error

[hassiebp]

Important

Adds a check in on_chain_error() in langchain.py to log a warning if run_id is missing, preventing errors from accessing non-existent runs.

• Behavior:
  • In on_chain_error() in langchain.py, added check for run_id existence in self.runs before ending run and updating trace.
  • Logs a warning if run_id is not found, instead of raising an exception.

^{This description was created by for 1f14784. It will automatically update as commits are pushed.}

[greptile-apps]

Disclaimer: Experimental PR review

PR Summary

Improved error handling in the LangchainCallbackHandler to prevent crashes when run_id is missing during chain errors.

• Added defensive check in langfuse/callback/langchain.py to verify run_id exists before accessing runs dictionary
• Implemented warning log message when run_id is not found instead of raising KeyError
• Enhanced error handling robustness for LangChain integration error scenarios

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