jedcunningham opened a new pull request, #35316:
URL: https://github.com/apache/airflow/pull/35316

   Somehow a DAG ended up in a state where `dag.tasks` was empty, but the root 
tasks group had an operator. I'm not sure how it got in this state, but it does 
kill the scheduler, and since it's easy to check for when parsing lets check it 
proactively.


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