def has_parent_objectives(self, objective_id=None):
if objective_id is None:<EOL><INDENT>raise NullArgument()<EOL><DEDENT>return bool(self.get_parent_objectives(objective_id))<EOL>
Tests if the Objective has any parents.

        arg:    objective_id (osid.id.Id): the Id of an objective
        return: (boolean) - true if the objective has parents, false
                otherwise
        raise:  NotFound - objective_id is not found
        raise:  NullArgument - objective_id is null
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        compliance: mandatory - This method must be implemented.