code: def is_all_field_none(self):
          
  
          if self._state is not None:
              return False
  
          if self._time_start is not None:
              return False
  
          if self._time_end is not None:
              return False
  
          if self._error_message is not None:
              return False
  
          if self._scheduled_object is not None:
              return False
  
          if self._result_object is not None:
              return False
  
          if self._request_reference_split_the_bill is not None:
              return False
  
          return True
docs: :rtype: bool