def tearDown(self):
        for p in self.player, self.observer:
            try:
                p.destroy()
            except AttributeError:
                pass
REST API operation to deactivate projector elements. It expects a
dataset/ETHPy150Open twisted/imaginary/imaginary/test/commandutils.py/CommandTestCaseMixin.tearDown--crossover with--dataset/ETHPy150Open OpenSlides/OpenSlides/openslides/core/views.py/ProjectorViewSet.deactivate_elements