docs: def state_destruction(self, model, prop_name, info):
          """ Close state editor when state is being destructed """
          import rafcon.gui.singleton as gui_singletons
          states_editor_ctrl = gui_singletons.main_window_controller.get_controller('states_editor_ctrl')
          state_identifier = states_editor_ctrl.get_state_identifier(self.model)
          states_editor_ctrl.close_page(state_identifier, delete=True)