Use empty snapshots list when there are no shared elements.

    protected ArrayList<View> createSnapshots(Bundle state, Collection<String> names) {

        int numSharedElements = names.size();

        ArrayList<View> snapshots = new ArrayList<View>(numSharedElements);

        if (numSharedElements == 0) {

            return null;

            return snapshots;

        }

        ArrayList<View> snapshots = new ArrayList<View>(numSharedElements);

        Context context = getWindow().getContext();

        int[] decorLoc = new int[2];

        ViewGroup decorView = getDecor();