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## Description This PR fixes issue #12805 by adding validation to handle whitespace-only questions in the `/retrieval` endpoint. ## Problem Sending a single space `" "` as the `question` parameter to `/retrieval` crashes the request with an `AssertionError`. This happens because: 1. The endpoint doesn't trim or validate the question parameter 2. A whitespace-only string is treated as valid input 3. The retrieval logic only checks for empty strings (which are falsy), but `" "` is truthy 4. Invalid match expressions are constructed, causing an assertion failure in the Elasticsearch layer ## Solution - Trim whitespace from the question parameter before processing - Return an empty result for whitespace-only or empty questions - Prevents the AssertionError and provides expected behavior ## Changes - Added whitespace trimming and validation in `api/apps/sdk/doc.py` - Returns empty result early if question is empty after trimming ## Testing - Tested with single space input - now returns empty result instead of crashing - Tested with empty string - returns empty result - Tested with normal questions - works as expected Fixes #12805 Co-authored-by: Daniel <daniel@example.com>