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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