def for_viewer(self, user):
        return self.get_queryset().for_viewer(user)
Could this evaluate to be "None".
dataset/ETHPy150Open ExCiteS/geokey/geokey/contributions/managers.py/ObservationManager.for_viewer--crossover with--dataset/ETHPy150Open kayhayen/Nuitka/nuitka/nodes/NodeBases.py/ExpressionMixin.mayBeNone