GitHub user piomar123 added a comment to the discussion: on_failure_callback 
when the DAG (not a task) fails

My assumption is `IndexError` - you try to get the first "failed" task, but if 
only the DAG fails, there will be none and the callback fails.

GitHub link: 
https://github.com/apache/airflow/discussions/38897#discussioncomment-11843308

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