Merge "Null check file.list() results."

    @Override

    public void onAttached() {

        super.onAttached();

        File file = new File("/vendor/overlay");

        ArrayList<String> options = Lists.newArrayList(file.list());

        String def = SystemProperties.get("ro.boot.vendor.overlay.theme");

        if (TextUtils.isEmpty(def)) {

            def = getContext().getString(R.string.default_theme);

        }

        String[] fileList = new File("/vendor/overlay").list();

        ArrayList<String> options = fileList != null

                ? Lists.newArrayList(fileList) : new ArrayList<>();

        if (!options.contains(def)) {

            options.add(0, def);

        }