better behaviour for labq with bad type
better behaviour for labq with bad type

labq images with the type set incorrectly were not handled well

wishabi/libvips,leiyangyou/libvips,mcanthony/libvips,mcanthony/libvips,mcanthony/libvips,lovell/libvips,wishabi/libvips,leiyangyou/libvips,jcupitt/libvips,mcanthony/libvips,wishabi/libvips,lovell/libvips,wishabi/libvips,jcupitt/libvips,lovell/libvips,jcupitt/libvips,leiyangyou/libvips,lovell/libvips,leiyangyou/libvips,jcupitt/libvips