marklavrynenko-original opened a new pull request #3897: [AIRFLOW-2263] Fix 500 for null DAG URL: https://github.com/apache/incubator-airflow/pull/3897 ### Jira My PR addresses the following [AIRFLOW-2263](https://issues.apache.org/jira/browse/AIRFLOW-2263) ### Description Remove 500-error when opening non-existent DAG in webserver UI `/admin/airflow/tree?dag_id=some_garbage` Return 404 response instead ### Tests My PR do not add new unit tests
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