ashb commented on issue #5423: [AIRFLOW-3739] Remove start_date requirement on 
DAG
URL: https://github.com/apache/airflow/pull/5423#issuecomment-502639373
 
 
   I would have thought that an condition something like:
   
   ```python
   if not self.start_date and not task.start_date and self.schedule_interval:
       raise ...
   ```
   
   would be what we want - a start_date is required unless the schedule 
interval is set. Additionally how does the scheduler cope when it comes across 
this job? We should probably add a test to that that checks that such 
dags/tasks still run.

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