code: def get_join_info(self):
          
          x=self.get_muc_child()
          if not x:
              return None
          if not isinstance(x,MucX):
              return None
          return x
docs: If `self` is a MUC room join request return the information contained.
  
          :return: the join request details or `None`.
          :returntype: `MucX`