Deletes config cache after each test if it exists.

openslides/utils/test.py

@@ -25,6 +25,14 @@ class TestCase(_TestCase):
     def _pre_setup(self, *args, **kwargs):
         return_value = super(TestCase, self)._pre_setup(*args, **kwargs)
         post_database_setup.send(sender=self)
-        # Resetting the config object by deleting the cache
-        del config._cache
+        return return_value
+
+    def _post_teardown(self, *args, **kwargs):
+        return_value = super(TestCase, self)._post_teardown(*args, **kwargs)
+        # Resets the config object by deleting the cache
+        try:
+            del config._cache
+        except AttributeError:
+            # The cache has only to be deleted if it exists.
+            pass
         return return_value