uranusjr commented on pull request #16931:
URL: https://github.com/apache/airflow/pull/16931#issuecomment-950539145


   Generally looks good to me now! One thing I'm wondering is how `None` and 
`""` differ semantically. From the current implementation in HTML, they seem to 
be equal? How could a difference be introduced in the future? If there are no 
differences in semantics for our current use cases, IMO it'd be a good idea to 
*forbid* None (NULL in database) for now to save it for potential use cases 
that may come up.


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