docs: def update_model_connector(self, model_id, connector):
          """Update the connector information for a given model.
  
          Returns None if the specified model not exist.
  
          Parameters
          ----------
          model_id : string
              Unique model identifier
          connector : dict
              New connection information
  
          Returns
          -------
          ModelHandle
          """
          # Validate the given connector information
          self.validate_connector(connector)
          # Connector information is valid. Ok to update the model.
          return self.registry.update_connector(model_id, connector)