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When collections are empty because they have just been created (synchronizeCollectionTree or equivalent operation), an application using EntityTreeModel will not fetch their contents, assuming they are truly empty (contain no items). This is done for optimization purposes. This patch make ETM only skip collections which are known to be empty. We can't just check the statistics for the optimization because the statistics will report zero until something is requested if the resource simply has not been sync'd yet. BUG: 271913 REVIEW: 101844
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