fix(client): auth check on missing credentials

[hassiebp]

Important

Handle AttributeError in auth_check() in client.py by logging a warning and returning False if the client is not properly initialized.

• Behavior:
  • In auth_check() in client.py, handle AttributeError by logging a warning and returning False if the client is not properly initialized.
• Logging:
  • Add warning log for AttributeError in auth_check() to indicate improper client initialization.

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Greptile Summary

Disclaimer: Experimental PR review

Enhanced error handling in auth_check() method to prevent crashes when credentials are missing or invalid, improving client initialization robustness.

• Added AttributeError handling in langfuse/_client/client.py to gracefully handle cases where self.api is not accessible
• Returns False and logs warning when authentication fails due to missing credentials
• Maintains compatibility with existing auth_check() boolean return contract

[greptile-apps]

LGTM

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