Patching null dereference in AbstractFloatingView.getOpenView()

    protected static <T extends AbstractFloatingView> T getOpenView(

            ActivityContext activity, @FloatingViewType int type) {

        BaseDragLayer dragLayer = activity.getDragLayer();

        if (dragLayer == null) return null;

        // Iterate in reverse order. AbstractFloatingView is added later to the dragLayer,

        // and will be one of the last views.

        for (int i = dragLayer.getChildCount() - 1; i >= 0; i--) {