Only open KCM in systemsettings if it can be displayed
We have to check for the presence of a X-KDE-System-Settings-Parent-Category entry when opening a KCM in systemsettings. BUG: 423612
We have to check for the presence of a X-KDE-System-Settings-Parent-Category entry when opening a KCM in systemsettings. BUG: 423612