def get_grade_entry_notification_session(self, grade_entry_receiver=None, proxy=None):
if proxy is None:<EOL><INDENT>raise NullArgument()<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the notification session for notifications pertaining to grade entry changes.

        arg:    grade_entry_receiver (osid.grading.GradeEntryReceiver):
                the grade entry receiver
        arg:    proxy (osid.proxy.Proxy): a proxy
        return: (osid.grading.GradeEntryNotificationSession) - a
                ``GradeEntryNotificationSession``
        raise:  NullArgument - ``grade_entry_receiver`` or ``proxy`` is
                ``null``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_grade_entry_notification()``
                is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_grade_entry_notification()`` is ``true``.*