contribute_to_class should be returning None
contribute_to_class should be returning None

this might be the root cause of some of the other
issues ive been seeing
pombredanne/django-activity-stream,thelabnyc/django-activity-stream,thelabnyc/django-activity-stream,justquick/django-activity-stream,pombredanne/django-activity-stream,jrsupplee/django-activity-stream,jrsupplee/django-activity-stream,justquick/django-activity-stream