Return nil for user auth with api key if api key has no user.
Return nil for user auth with api key if api key has no user.

timgluz/versioneye-core,versioneye/versioneye-core,versioneye/versioneye-core,versioneye/versioneye-core,timgluz/versioneye-core,timgluz/versioneye-core