Fix deadlock that could occur sometimes during mixing#703

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UdjinM6 wants to merge 1 commit into

dashpay:v0.12.1.xfrom

UdjinM6:fixdsdeadlock

Commits on Feb 27, 2016

Fix deadlock that could occur sometimes during mixing - it's better to fail here than to lock wallet and stop recieving next blocks because of that
UdjinM6
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