Melhora construção de not_list

sapl/materia/views.py

@@ -2085,10 +2085,9 @@ class MateriaAnexadaEmLoteView(PermissionRequiredMixin, FilterView):
         qr = self.request.GET.copy()
         context['object_list'] = context['object_list'].order_by(
             'ano', 'numero')
-        not_list = [self.kwargs['pk']]
         principal = MateriaLegislativa.objects.get(pk=self.kwargs['pk'])
-        for m in principal.materia_principal_set.all():
+        not_list = [self.kwargs['pk']] + \
-            not_list.append(m.materia_anexada.id)
+                    [m for m in principal.materia_principal_set.all().values_list('materia_anexada_id', flat=True)]
         context['object_list'] = context['object_list'].exclude(pk__in=not_list)
         context['filter_url'] = ('&' + qr.urlencode()) if len(qr) > 0 else ''