[nautilus] application: don't unref unconditionally

[Cosimo Cecchi <cosimoc src gnome org>]

commit e0f68583d47d23738afd7695f6137e2d2552b45d
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Wed Oct 27 15:06:45 2010 +0200

    application: don't unref unconditionally
    
    As we're building the NautilusUndoManager in _startup() now, which might
    not have been called if the application is remote.

 src/nautilus-application.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/src/nautilus-application.c b/src/nautilus-application.c
index 2ae3732..ecc4424 100644
--- a/src/nautilus-application.c
+++ b/src/nautilus-application.c
@@ -1418,8 +1418,11 @@ nautilus_application_finalize (GObject *object)
 	application = NAUTILUS_APPLICATION (object);
 
 	nautilus_bookmarks_exiting ();
-	
-	g_object_unref (application->undo_manager);
+
+	if (application->undo_manager != NULL) {
+		g_object_unref (application->undo_manager);
+		application->undo_manager = NULL;
+	}
 
 	if (application->volume_monitor) {
 		g_object_unref (application->volume_monitor);