steipete/PSTCollectionView — pull request #204 by neilkimmett (2013-02-08 12:52:13+00:00)
Title: Fix inconsistency with UICollectionView's performBatchUpdates:completion: behaviour

When `UICollectionViews`'s `performBatchUpdates:completion` is called with `nil` for each of the block parameters, the view still animates any changes to the layout. The early return from `PSTCollectionView`'s corresponding method meant that it behaved differently, this change fixes that.