Fix 'NoneType' object has no attribute 'has_task'

[nvn01234]

Fix 'NoneType' object has no attribute 'has_task'

I got an error, somehow refreshed_dag_info is null

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[uranusjr]

Can you add a test for this?

[shahar1]

What TP suggested + small refactoring :)

Note for committer: please backport to v2-10-test.

[shahar1]

Suggested change

	if not os.path.exists(correct_maybe_zipped(dag_to_wait.fileloc)):
	raise AirflowException(f"The external DAG {self.external_dag_id} was deleted.")
	refreshed_dag_info = DagBag(dag_to_wait.fileloc).get_dag(self.external_dag_id)
	if not refreshed_dag_info:
	raise AirflowException(f"The external DAG {self.external_dag_id} was deleted.")
	refreshed_dag_info = DagBag(dag_to_wait.fileloc).get_dag(self.external_dag_id)
	if not (os.path.exists(correct_maybe_zipped(dag_to_wait.fileloc)) and refreshed_dag_info):
	raise AirflowException(f"The external DAG {self.external_dag_id} was deleted.")

[github-actions]

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