Gets the next Objective in this list.

        return: (osid.learning.Objective) - the next Objective in this
                list. The has_next() method should be used to test that
                a next Objective is available before calling this
                method.
        raise:  IllegalState - no more elements available in this list
        raise:  OperationFailed - unable to complete request
        compliance: mandatory - This method must be implemented.

def get_next_objective(self):
        """Gets the next Objective in this list.

        return: (osid.learning.Objective) - the next Objective in this
                list. The has_next() method should be used to test that
                a next Objective is available before calling this
                method.
        raise:  IllegalState - no more elements available in this list
        raise:  OperationFailed - unable to complete request
        compliance: mandatory - This method must be implemented.

        """
        try:
            next_object = next(self)
        except StopIteration:
            raise IllegalState('no more elements available in this list')
        except Exception:  # Need to specify exceptions here!
            raise OperationFailed()
        else:
            return next_object