Fix uservoice tests Rewrite test_empty_key in the same way as in the other modules. Delete test_overridden_empty_key, because the Node (In this case, the UserVoiceNode) should not be created if there is no configuration initially.
Fix uservoice tests
Rewrite test_empty_key in the same way as in the other modules.
Delete test_overridden_empty_key, because the Node (In this case, the UserVoiceNode) should not be created if there is no configuration initially.

bittner/django-analytical,jcassee/django-analytical,pjdelport/django-analytical