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Some prompts/models occasionally return pure prose with no JSON object even on retry. Returning None (and logging a preview) lets the pipeline skip that one VLM call cleanly instead of aborting the whole episode. The modules already check for None / non-dict results and degrade gracefully (no row emitted from that call). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>