Merge "WifiScanner: check nullness of bundle extra"

    public List<Integer> getAvailableChannels(@WifiBand int band) {

        try {

            Bundle bundle = mService.getAvailableChannels(band, mContext.getOpPackageName());

            return bundle.getIntegerArrayList(GET_AVAILABLE_CHANNELS_EXTRA);

            List<Integer> channels = bundle.getIntegerArrayList(GET_AVAILABLE_CHANNELS_EXTRA);

            return channels == null ? new ArrayList<>() : channels;

        } catch (RemoteException e) {

            throw e.rethrowFromSystemServer();

        }