[GitHub] [airflow] ashb opened a new pull request #5435: [AIRFLOW-4759] Don't error when marking sucessful run as failed

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

ashb opened a new pull request #5435: [AIRFLOW-4759] Don't error when marking sucessful run as failed
URL: https://github.com/apache/airflow/pull/5435
 
 
   ### Jira
   
   - [x] https://issues.apache.org/jira/browse/AIRFLOW-4759 (Same jira as original PR)
   
   ### Description
   
   - [x] The previous PR (#5403) that optimized the DB queries introduced an edge
   case which would cause this to fail if no tasks were passed in. (an un-cuaght
   StopIteration)
   
   ### Tests
   
   - [x] Tests added
   
   ### 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/)":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   
   ### Documentation
   
   - [x] In case of new functionality, my PR adds documentation that describes how to use it.
     - All the public functions and the classes in the PR contain docstrings that explain what it does
     - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
   
   ### Code Quality
   
   - [x] Passes `flake8`
   

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