Intercept document list view exception and display them as an error message.

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

HISTORY.rst

@@ -12,6 +12,7 @@
 * Add database conversion test to the common app.
 * Fix label display for resolved smart links when not using a dynamic label.
 * Only show smart link resolution errors to the user with the smart link edit permission.
+* Intercept document list view exception and display them as an error message.
 
 3.1.1 (2018-09-18)
 ==================

mayan/apps/documents/views/document_views.py

@@ -62,6 +62,20 @@ class DocumentListView(SingleObjectListView):
     object_permission = permission_document_view
     queryset_slice = None
 
+    def get_context_data(self, **kwargs):
+        try:
+            return super(DocumentListView, self).get_context_data(**kwargs)
+        except Exception as exception:
+            messages.error(
+                self.request, _(
+                    'Error retrieving document list: %(exception)s.'
+                ) % {
+                    'exception': exception
+                }
+            )
+            self.object_list = Document.objects.none()
+            return super(DocumentListView, self).get_context_data(**kwargs)
+
     def get_document_queryset(self):
         return Document.objects.defer(
             'description', 'uuid', 'date_added', 'language', 'in_trash',