uranusjr commented on PR #24401:
URL: https://github.com/apache/airflow/pull/24401#issuecomment-1153215501

   I don’t think returning None is the correct thing to do. Since the 
downstream _should not_ run if any of its depended upstream XCom values fail to 
resolve, perhaps it would make sense to mark the downstream as SKIPPED in this 
situation.


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