load_printers() removes stale printers and we should only remove them if
we have a CUPS connection and talked to cups. Else we will remove every
configured printer if cups is not available.
Autobuild-User: Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date: Mon Sep 5 11:18:23 CEST 2011 on sn-devel-104