def has_child_objective_banks(self, objective_bank_id=None):
pass<EOL>
Tests if an objective bank has any children.

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