[nautilus] Don't crash on NULL gconf value

[Alexander Larsson <alexl src gnome org>]

commit bd108f3700594e5c859d89287a59733a5585e4d9
Author: Padraig O'Briain <padraig obriain sun com>
Date:   Mon Sep 7 09:44:18 2009 +0200

    Don't crash on NULL gconf value
    
    This fixes bug #589520

 .../nautilus-desktop-directory-file.c              |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/libnautilus-private/nautilus-desktop-directory-file.c b/libnautilus-private/nautilus-desktop-directory-file.c
index b1af844..bd2a84d 100644
--- a/libnautilus-private/nautilus-desktop-directory-file.c
+++ b/libnautilus-private/nautilus-desktop-directory-file.c
@@ -554,6 +554,9 @@ nautilus_desktop_update_metadata_from_gconf (NautilusFile *file,
 		key = gconf_entry_get_key (entry);
 		value = gconf_entry_get_value (entry);
 
+                if (value == NULL) {
+			continue;
+		}
 		key = strrchr (key, '/') + 1;
 
 		gio_key = g_strconcat ("metadata::", key, NULL);