Crash when Network Manager does not find any device

[Javier Fernandez Garcia-Boente]

I think i've found out a bug in connectivity-networkmanager.c code,
which causes a crash when the nm module does not return any available
device. I guess that should not happen under regular conditions, with
the NetworkManager being well configured, which i think thats not the
case of my testing environment (i am using gentoo), but anyway, i think
the code is buggy because it should check if the "device" variable is
NULL before using it. 

I've attached a preliminary patch to show the problem. If we all agree
its actually a bug, i could open it in the bugzilla and work on a more
serious patch proposal. 

-- 
Javier Fernández García-Boente
http://blogs.igalia.com/jfernandez/
www.igalia.com
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