message: fixed missing return code
diff: @@ -170,7 +170,7 @@ NrtResult Nrt_AudioService_setMusicVolume(NrtAudioService service, float value)
  try {
  serv->setMusicVolume(value);
  } catch( const Exceptions::NotInitialisedException){ // todo: handle error message
  -
  + return NRT_FAILURE_NOT_INITIALISED;
  }
  return NRT_SUCCESS;
  