def get_id_issue_session(self, proxy=None):
Gets the session associated with the id issue service.

        arg:    proxy (osid.proxy.Proxy): a proxy
        return: (osid.id.IdIssueSession) - an ``IdIssueSession``
        raise:  NullArgument - ``proxy`` is ``null``
        raise:  OperationFailed - ``unable to complete request``
        raise:  Unimplemented - ``supports_id_issue()`` is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_id_issue()`` is ``true``.*