@utilities.arguments_not_none<EOL><INDENT>def has_child_objectives(self, objective_id):<DEDENT>
raise errors.Unimplemented()<EOL>
Tests if an objective has any children.

        arg:    objective_id (osid.id.Id): the ``Id`` of an objective
        return: (boolean) - ``true`` if the ``objective_id`` has
                children, ``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.*