def get_queryset(self):
        return self._queryset_class(model=self.model, using=self._db, hints=self._hints)
If a dataset has been marked as deleted *and* it is leased, no changes
dataset/ETHPy150Open django/django/django/db/models/manager.py/BaseManager.get_queryset--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/test/test_blockdevice.py/BlockDeviceDeployerDestructionCalculateChangesTests.test_no_delete_if_leased