ac1b772ec8e428acd23322a6fccbde2bda6b8bd2
If focus is locked repeatedly and fast on Lumia 920 FocusAsync returns null IAsyncAction and ::await crash on null pointer. Fix crash by returning early from method when operation in progress. Change-Id: Ie268fd2276d3e9090a47bf362cd58743bb83284a Reviewed-by: Andrew Knight <andrew.knight@intopalo.com>
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