[empathy] Fix crash when joining a chat, GTK_WIDGET_VISIBLE is not NULL-safe

[Xavier Claessens <xclaesse src gnome org>]

commit be81b40879b405f5baff65c885cb564bdf2404ca
Author: Xavier Claessens <xclaesse gmail com>
Date:   Sun Oct 25 17:54:49 2009 +0100

    Fix crash when joining a chat, GTK_WIDGET_VISIBLE is not NULL-safe

 src/empathy-chat-window.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/src/empathy-chat-window.c b/src/empathy-chat-window.c
index e2d946c..00ecc77 100644
--- a/src/empathy-chat-window.c
+++ b/src/empathy-chat-window.c
@@ -349,8 +349,7 @@ chat_window_update (EmpathyChatWindow *window)
 	menu = gtk_ui_manager_get_widget (priv->ui_manager,
 		"/chats_menubar/menu_contact");
 	orig_submenu = gtk_menu_item_get_submenu (GTK_MENU_ITEM (menu));
-	if (!GTK_WIDGET_VISIBLE (orig_submenu))
-	{
+	if (orig_submenu == NULL || !GTK_WIDGET_VISIBLE (orig_submenu)) {
 		submenu = empathy_chat_get_contact_menu (priv->current_chat);
 		gtk_menu_item_set_submenu (GTK_MENU_ITEM (menu), submenu);
 		gtk_widget_show (menu);