Summary:
Sometimes list view row components(even the ones unseen) have a frame but its x and y is 0 or uninitialized at view loading time, which will lead to _updateVisibleRows firing for all the row components incorrectly at loading time.
This is to make the code more defensive.
Reviewed By: sahrens
Differential Revision: D3308515
fbshipit-source-id: 0e30fdf10345629bfd9de3fe0ad641bb1903fe00