--- tools/libvirt-guests.sh.in.orig	2016-06-12 15:56:38.723812389 +0200
+++ tools/libvirt-guests.sh.in	2016-06-12 15:57:21.998048371 +0200
@@ -142,7 +142,7 @@
         return 1
     fi
 
-    echo "$list" | grep -v 00000000-0000-0000-0000-000000000000
+    echo "$list" | grep -v 00000000-0000-0000-0000-000000000000 | tr \\n ' '
 }
 
 # guest_name URI UUID