Statistics navigation links are not tied to querysets or model instances,

don't fail when failing to access their _meta field. Fixes GitLab issue #316.

mayan/apps/navigation/classes.py

@@ -367,7 +367,7 @@ class SourceColumn(object):
                         # Special case for queryset items produced from
                         # .defer() or .only() optimizations
                         return cls._registry[source._meta.parents.items()[0][0]]
-                    except (KeyError, IndexError):
+                    except (AttributeError, KeyError, IndexError):
                         return ()
         except TypeError:
             # unhashable type: list

mayan/apps/statistics/tests/test_views.py

@@ -34,3 +34,20 @@ class StatisticsViewTestCase(GenericViewTestCase):
         )
 
         self.assertEqual(response.status_code, 200)
+
+
+    def test_statistic_namespace_list_view_no_permissions(self):
+        self.login(username=TEST_USER_USERNAME, password=TEST_USER_PASSWORD)
+
+        response = self.get('statistics:namespace_list')
+
+        self.assertEqual(response.status_code, 403)
+
+    def test_statistic_namespace_list_view_with_permissions(self):
+        self.login(username=TEST_USER_USERNAME, password=TEST_USER_PASSWORD)
+
+        self.role.permissions.add(permission_statistics_view.stored_permission)
+
+        response = self.get('statistics:namespace_list')
+
+        self.assertEqual(response.status_code, 200)