[gnome-shell-extensions] window-list: Check if the window title is set

[Rui Matos <rtcm src gnome org>]

commit c0170ff9456df798feaeec176dddd8a7580a221b
Author: Rui Matos <tiagomatos gmail com>
Date:   Tue Feb 24 20:47:15 2015 +0100

    window-list: Check if the window title is set
    
    MetaWindow.title might be NULL, particularly for Wayland clients where
    setting the title is a request separate from window creation. We
    shouldn't try to set StLabel's text prop in that case.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=745064

 extensions/window-list/extension.js |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/extensions/window-list/extension.js b/extensions/window-list/extension.js
index 5c44272..f2b9811 100644
--- a/extensions/window-list/extension.js
+++ b/extensions/window-list/extension.js
@@ -169,6 +169,9 @@ const WindowTitle = new Lang.Class({
     },
 
     _updateTitle: function() {
+        if (!this._metaWindow.title)
+            return;
+
         if (this._metaWindow.minimized)
             this._label.text = '[%s]'.format(this._metaWindow.title);
         else