Merge "Fixed null pointer exception" into main

        final View[] children = mChildren;

        for (int i = 0; i < count; i++) {

            final View child = children[i];

            if (child == null) {

                throw new IllegalStateException(getClass().getSimpleName() + " contains null " +

                        "child at index " + i + " when traversal in dispatchGetDisplayList," +

                        " the view may have been removed.");

            }

            if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null)) {

                recreateChildDisplayList(child);

            }