Scott Foggo 50d6de9448 Check if either array is null before diffing
Reviewed By: sebmarkbage

Differential Revision: D3219392

fb-gh-sync-id: fd6ef2e2c2d7b661a06c857b25b007701340e20a
fbshipit-source-id: fd6ef2e2c2d7b661a06c857b25b007701340e20a
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