Minor fix.

protogeni/lib/GeniSliver.pm.in

@@ -867,8 +867,9 @@ sub UnProvision($)
 	if (!defined($uuid));
     my $node       = Node->Lookup($uuid);
     if (!defined($node)) {
+	# Lets call this nonfatal since it might be a virtnode that 
 	print STDERR "Could not map node $uuid to its object\n";
-	return -1;
+	return 0;
     }
     my $reservation = $node->Reservation();
     if (!defined($reservation)) {