Move stub filtering to the Document model manager

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/documents/dashboard_widgets.py

@@ -55,7 +55,7 @@ class DashboardWidgetDocumentsTotal(DashboardWidgetNumeric):
         )
         self.count = AccessControlList.objects.filter_by_access(
             permission=permission_document_view, user=request.user,
-            queryset=Document.objects.filter(is_stub=False)
+            queryset=Document.objects.all()
         ).count()
         return super(DashboardWidgetDocumentsTotal, self).render(request)