Comment 2 for bug 964897

StacktraceTop:
 _M_grab (__alloc2=<optimized out>, __alloc1=..., this=<optimized out>) at /build/buildd/gcc-4.6-4.6.3/build/x86_64-linux-gnu/libstdc++-v3/include/bits/basic_string.h:224
 std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string (this=0x7fff05f21410, __str=...) at /build/buildd/gcc-4.6-4.6.3/build/x86_64-linux-gnu/libstdc++-v3/include/bits/basic_string.tcc:175
 unity::launcher::HudLauncherIcon::HudLauncherIcon(unity::launcher::LauncherHideMode)::{lambda(_GVariant*)#1}::operator()(_GVariant*) const () at /usr/include/Nux-2.0/NuxCore/Property-inl.h:87
 operator() (_A_a1=@0x7fff05f21468, this=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:515
 unity::UBusManager::OnCallback (args=0x10ae4a0, user_data=<optimized out>) at /build/buildd/unity-5.8.0/plugins/unityshell/src/UBusWrapper.cpp:67