ashb commented on issue #20320:
URL: https://github.com/apache/airflow/issues/20320#issuecomment-1039609847


   An empty string is distinct from a null value. This is a bug in our 
OpenAPI/marshmallow schemas.
   
   See also 
https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-believe-about-names/


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