Comment 2 for bug 1162289

StacktraceTop:
 emit (_A_a1=@0x2a76ed8: false, impl=0x28) at /usr/include/sigc++-2.0/sigc++/signal.h:1002
 emit (_A_a1=@0x2a76ed8: false, this=<optimized out>) at /usr/include/sigc++-2.0/sigc++/signal.h:2781
 operator() (__closure=<optimized out>) at /build/buildd/unity-6.12.0daily13.03.29.1/launcher/VolumeImp.cpp:63
 operator() (this=<optimized out>) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
 sigc::internal::slot_call0<unity::launcher::VolumeImp::Impl::Impl(unity::glib::Object<_GVolume> const&, std::shared_ptr<unity::FileManager> const&, std::shared_ptr<unity::launcher::DeviceNotificationDisplay> const&, unity::launcher::VolumeImp*)::{lambda()#3}, void>::call_it(sigc::internal::slot_rep*) (rep=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103