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Commit f98f7b96 authored by Andrew Lee's avatar Andrew Lee
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Null-protect attempt to get EmergencyButton. 

Not all device layouts, such as for tablets, will have an Emergency
Button, so check for null before attempting to set a callback.

Bug: 18977746
Change-Id: I0e909e71c51f6923edda4707bb25053a5f2de398
parent d8f32ea2
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