
If there is no WM_CLASS for a tray icon, it returns null, not the empty string. Detect that case without an exception. https://bugzilla.gnome.org/show_bug.cgi?id=683724
If there is no WM_CLASS for a tray icon, it returns null, not the empty string. Detect that case without an exception. https://bugzilla.gnome.org/show_bug.cgi?id=683724