fixed keyworder interface in apps.nigeria
fixed keyworder interface in apps.nigeria

it was blindly trying to call _func_, which may be None, and catching
the TypeError; which meant that any handlers which raise a type error
(like the one i'm working on!) will fail silently

dimagi/rapidsms-contrib-apps-dev,rapidsms/rapidsms-contrib-apps-dev,rapidsms/rapidsms-contrib-apps-dev,dimagi/rapidsms-contrib-apps-dev