**Task**
With a single user signed in and no example data filled, the /users/ page returns a server error because the coordinators user set is empty:
```
Traceback:
...
File "/app/TWLight/view_mixins.py" in dispatch
95. if not self.test_func_coordinator_or_self(request.user):
File "/app/TWLight/view_mixins.py" in test_func_coordinator_or_self
59. if user in coordinators.user_set.all():
Exception Type: AttributeError at /users/
Exception Value: 'NoneType' object has no attribute 'user_set'
```
In `test_func_coordinator_or_self` we should first ensure that there are coordinators before doing `if user in coordinators.user_set.all()`, by adding `if coordinators:` to the line above.
This change likely needs to be implemented in `CoordinatorOrSelf`, `CoordinatorsOnly`, and `PartnerCoordinatorOnly` in `view_mixins.py`.
It would be useful to add a new test in `users/tests.py` for this case: One user, no coordinators, and test that the page can load successfully.
**Good first bug**
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