andy dreyfuss created AIRFLOW-2263:
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Summary: stack trace from null dag in webserver output
Key: AIRFLOW-2263
URL: https://issues.apache.org/jira/browse/AIRFLOW-2263
Project: Apache Airflow
Issue Type: Bug
Reporter: andy dreyfuss
webserver is reporting the following
```
Traceback (most recent call last):
File "/path/to/a/virtualenv/lib/python3.6/site-packages/flask/app.py", line
1988, in wsgi_app
response = self.full_dispatch_request()
File "/path/to/a/virtualenv/lib/python3.6/site-packages/flask/app.py", line
1641, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/path/to/a/virtualenv/lib/python3.6/site-packages/flask/app.py", line
1544, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/path/to/a/virtualenv/lib/python3.6/site-packages/flask/_compat.py",
line 33, in reraise
raise value
File "/path/to/a/virtualenv/lib/python3.6/site-packages/flask/app.py", line
1639, in full_dispatch_request
rv = self.dispatch_request()
File "/path/to/a/virtualenv/lib/python3.6/site-packages/flask/app.py", line
1625, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/path/to/a/virtualenv/lib/python3.6/site-packages/flask_admin/base.py",
line 69, in inner
return self._run_view(f, *args, **kwargs)
File "/path/to/a/virtualenv/lib/python3.6/site-packages/flask_admin/base.py",
line 368, in _run_view
return fn(self, *args, **kwargs)
File "/path/to/a/virtualenv/lib/python3.6/site-packages/flask_login.py", line
755, in decorated_view
return func(*args, **kwargs)
File "/path/to/a/virtualenv/lib/python3.6/site-packages/airflow/www/utils.py",
line 356, in view_func
return f(*args, **kwargs)
File "/path/to/a/virtualenv/lib/python3.6/site-packages/airflow/www/utils.py",
line 262, in wrapper
return f(*args, **kwargs)
File "/path/to/a/virtualenv/lib/python3.6/site-packages/airflow/www/views.py",
line 1154, in tree
base_date = dag.latest_execution_date or datetime.utcnow()
AttributeError: 'NoneType' object has no attribute 'latest_execution_date'```
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