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Prevent data source deallocation during async updates
Summary: Saw some crashes come in from out-of-sync objects and section controllers. After some digging I found that the nil-datasource assert was firing (not very frequently). Mostly happening on other VCs, probably from hitting the back button and an update arriving. Reviewed By: jessesquires Differential Revision: D4347862 fbshipit-source-id: 38c1a4816f5c109de41297309745ac2d5e348e93
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Ryan Nystrom
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Dec 19, 2016
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