sys: only run mdadm if RAID devices actually exist (Closes: #572450)

ChangeLog

+version 0.9.8 -- UNRELEASED
+    handler changes
+	sys:
+	 . Only run mdadm if RAID devices actually exist (Closes: #572450)
+
 version 0.9.7 -- January 27, 2010
     backupninja changes
 	 . fix bug in reportspace, thanks Dan Garthwaite

handlers/sys.in

@@ -462,7 +462,9 @@ STATUS="Collecting Software RAID information (/etc/mdadm.conf)"
 catiffile "/etc/mdadm.conf"
 
 STATUS="Collecting Software RAID information (/sbin/mdadm -Q)"
+if ls /dev/md?* >/dev/null 2>&1; then
    catifexec "/sbin/mdadm" "-Q" "--detail" '/dev/md?*'
+fi
 
 STATUS="Collecting Automount information (auto.master)"
 catiffile "/etc/auto.master"