small fix for consistency
small fix for consistency

GreatBizTools/django-threaded-messages,philippWassibauer/django-threaded-messages,siovene/django-threaded-messages,siovene/django-threaded-messages,GreatBizTools/django-threaded-messages,siovene/django-threaded-messages,GreatBizTools/django-threaded-messages,philippWassibauer/django-threaded-messages