bug#37428: Keyboard layout setting fails when no keyboard is attached

[quiliro]

This is my setting for that section:

 (services (append (list
            (service gnome-desktop-service-type)
            (service xfce-desktop-service-type)
            (set-xorg-configuration
             (xorg-configuration             ;for Xorg
              (keyboard-layout keyboard-layout))))
            %desktop-services))

I hope it is helpful.