Follow-up from "Draft: Process one record at a time in Bulk Import pipelines"

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The following discussion from !52330 (merged) should be addressed:

• @georgekoltsov started a discussion: (+3 comments)

  Have to add safe navigation operator here due to return of nil when exception occurs (which we rescue and track in run_pipeline_step). I had another idea of returning 'empty ExtractedData response object' when this happens but since we rescue in run_pipeline_step which is used in transformation and loading, we can't return empty ExtractedData object there.