[1.6.x] PEP8 cleanup

    def test_ticket_22998(self):

        related = Related.objects.create()

        content = Content.objects.create(related_obj=related)

        node = Node.objects.create(content=content)

        Node.objects.create(content=content)

        # deleting the Related cascades to the Content cascades to the Node,

        # where the pre_delete signal should fire and prevent deletion.