code: def clear(self, autoBuild=True):
          
          for action in self._actionGroup.actions():
              self._actionGroup.removeAction(action)
          
          action = QAction('', self)
          action.setObjectName('place_holder')
          self._actionGroup.addAction(action)
          if autoBuild:
              self.rebuild()
docs: Clears the actions for this widget.