Don't "fail" when a dbus call returns no value
Don't "fail" when a dbus call returns no value

Reported by Christian Surlykke:
https://groups.google.com/group/razor-qt/browse_thread/thread/34b2836c9a6ea414

ThomasVie/liblxqt,lxde/liblxqt,pmattern/liblxqt,rbazaud/liblxqt,gilir/liblxqt-qt5,ThomasVie/liblxqt,pmattern/liblxqt,gilir/liblxqt-qt5,lxde/liblxqt,stefonarch/liblxqt,rbazaud/liblxqt,stefonarch/liblxqt