Fix for crasher bug 403565

["Padraig O'Briain" <Padraig Obriain Sun COM>]

Attached is a proposed fix for crasher bug
http://bugzilla.gnome.org/show_bug.cgi?id=403565

Padraig

--- /usr/tmp/clean/nautilus-2.17.90/libnautilus-private/nautilus-desktop-icon-file.c	Wed Jan  3 08:52:25 2007
+++ nautilus-2.17.90/libnautilus-private/nautilus-desktop-icon-file.c	Fri Feb  2 12:00:15 2007
@@ -321,7 +321,10 @@
 NautilusDesktopLink *
 nautilus_desktop_icon_file_get_link (NautilusDesktopIconFile *icon_file)
 {
-	return g_object_ref (icon_file->details->link);
+	if (icon_file->details->link)
+		return g_object_ref (icon_file->details->link);
+	else
+		return NULL;
 }
 
 static void