potiuk commented on pull request #18336:
URL: https://github.com/apache/airflow/pull/18336#issuecomment-922112766


   Agree with @mik-laj - in POSIX world. there is a difference between 
"missing" and "empty" variable and unless there is a good reason why we should 
treat  "empty" as "missing", I do not see why we should change it. 
   
   Why do you think we need that @oliverisaac ?


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