code: def _get_objects(self, o_type):
          
          if o_type not in [t for t in self.app.sched.pushed_conf.types_creations]:
              return None
  
          try:
              _, _, strclss, _, _ = self.app.sched.pushed_conf.types_creations[o_type]
              o_list = getattr(self.app.sched, strclss)
          except Exception:  # pylint: disable=broad-except
              return None
  
          return o_list
docs: Get an object list from the scheduler
  
          Returns None if the required object type (`o_type`) is not known or an exception is raised.
          Else returns the objects list
  
          :param o_type: searched object type
          :type o_type: str
          :return: objects list
          :rtype: alignak.objects.item.Items