Removed some logic that wasn't needed following removal of some deprecated code.

        obj.query.select_for_update_nowait = nowait

        return obj

    def select_related(self, *fields, **kwargs):

    def select_related(self, *fields):

        """

        Returns a new QuerySet instance that will select related objects.

        If select_related(None) is called, the list is cleared.

        """

        if kwargs:

            raise TypeError('Unexpected keyword arguments to select_related: %s'

                    % (list(kwargs),))

        obj = self._clone()

        if fields == (None,):

            obj.query.select_related = False