fix(experiments): remove dataset version from run item request if None

[hassiebp]

Important

Exclude None values from CreateDatasetRunItemRequest in _process_experiment_item() to prevent unnecessary data in requests.

• Behavior:
  • Modify _process_experiment_item() in client.py to exclude None values from CreateDatasetRunItemRequest by using .dict(exclude_none=True). This prevents datasetVersion from being included if it is None.

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Disclaimer: Experimental PR review

Greptile Summary

This PR fixes an issue where None values were being sent in dataset run item creation requests. The change adds .dict(exclude_none=True) when creating CreateDatasetRunItemRequest objects, ensuring that when datasetVersion is None, it is excluded from the API request payload.

Key Changes:

• Modified _process_experiment_item() in client.py:2934 to call .dict(exclude_none=True) on the CreateDatasetRunItemRequest object
• This prevents sending datasetVersion: None in the request when no dataset version is specified
• The change is consistent with the Pydantic model's built-in behavior for handling optional fields

Technical Context:

• The CreateDatasetRunItemRequest model already has a custom .dict() method that uses exclude_none by default (see create_dataset_run_item_request.py:51-66)
• The HTTP client's jsonable_encoder properly handles both Pydantic models and dictionaries
• When dataset_version parameter is None (which is the default), the field should not be included in the API request

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The change is a small, well-scoped fix that improves API request cleanliness by excluding None values. The implementation is correct - the HTTP client's jsonable_encoder handles dictionaries properly, and the CreateDatasetRunItemRequest model already has built-in support for exclude_none. No breaking changes or side effects expected.
• No files require special attention

Important Files Changed

Filename	Overview
langfuse/_client/client.py	Adds .dict(exclude_none=True) to prevent sending None values for datasetVersion in dataset run item requests. Change is safe and follows best practices for API request serialization.

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