declarative: if we cannot get a device from QtCamera then error out
declarative: if we cannot get a device from QtCamera then error out

alinelena/cameraplus,mer-hybris-kis3/cameraplus,mer-hybris-kis3/cameraplus,foolab/cameraplus,mlehtima/cameraplus,mer-hybris-kis3/cameraplus,mlehtima/cameraplus,foolab/cameraplus,mlehtima/cameraplus,mer-hybris-kis3/cameraplus,alinelena/cameraplus,alinelena/cameraplus,foolab/cameraplus,foolab/cameraplus,mlehtima/cameraplus,alinelena/cameraplus