[GitHub] [airflow] yuqian90 opened a new pull request #6812: [AIRFLOW-6250] handle_failure needs better default for context and test_mode

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yuqian90 opened a new pull request #6812: [AIRFLOW-6250] handle_failure needs better default for context and test_mode
URL: https://github.com/apache/airflow/pull/6812
 
 
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   ### Jira
   
   - [ ] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - https://issues.apache.org/jira/browse/AIRFLOW-6250
   
   ### Description
   
   - [ ] Here are some details about my PR, including screenshots of any UI changes:
   
   on_failure_callback almost always want to know the dag_id and taskinstance that failed. These info are in the context passed to on_failure_callback, which is passed in from handle_failure(). However, in some rare scenarios, if handle_failure is called in scheduler_job.py and backfill_job.py, the only argument passed is the error message. context is left as None. 
   
   So in these cases, on_failure_callback will not even know what's the dag_id of the dag that just failed. 
   
   This PR fixes this by setting context to get_template_context() if it's not given. 
   
   ### Tests
   
   - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   Added test in test_taskinstance.py
   
   ### Commits
   
   - [ ] 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
   
   - [ ] 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
   

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