[GitHub] exploy opened a new pull request #4038: [AIRFLOW-1970] Let empty Fernet key or special `no encryption` phrase.

[GitBox <gi...@apache.org>]

exploy opened a new pull request #4038: [AIRFLOW-1970] Let empty Fernet key or special `no encryption` phrase.
URL: https://github.com/apache/incubator-airflow/pull/4038
 
 
   ### Jira
   
   My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW-1970) issues and references them in the PR title. 
   
   ### Description
   
   Once the user has installed Fernet package then the application enforces setting valid Fernet key.
   This change will alter this behavior into letting empty Fernet key or special `no encryption` phrase and interpreting those two cases as no encryption desirable.
   
   ### Tests
   
   My PR adds no tests as of now.
   
   ### Commits
   
   - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
   
   ### Code Quality
   
   - [ ] Passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
   

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