good news now ;)
we've updatet again xlabel to version 3.0.7
it has new settings:
xLabelDesktopNoWorkspace
xLabelDesktopNoNetwork
xLabelDesktopNoTrashcan
xLabelDesktopNoMyDocuments

and xDesktop also:
xDesktopNoWorkspace
xDesktopNoNetwork
xDesktopNoTrashcan
xDesktopNoMyDocuments

so if set, the icon will not be seen anymore :D