Do not add layout attributes for header or footer if size is zero#24

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Commits on Apr 8, 2014

Do not add layout attributes for header or footer if size is zero
haitaoli
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Commits on Apr 9, 2014

Get number of sections/items directly from datasource. UICollectionView.numberOfSections returns old number before animation happens.
haitaoli
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Fix layout with empty sections
haitaoli
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