[gnome-music] Remove the JS Error when closing app

[Seif Lotfy <seiflotfy src gnome org>]

commit 6f7b8b308302fe3c75e99089947acf226ecf78f0
Author: Shivani Poddar <shivani poddar92 gmail com>
Date:   Mon May 20 04:12:34 2013 +0530

    Remove the JS Error when closing app
    
    Signed-off-by: Seif Lotfy <seif lotfy com>

 src/window.js |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/src/window.js b/src/window.js
index 97c070d..4b859a1 100644
--- a/src/window.js
+++ b/src/window.js
@@ -87,8 +87,11 @@ const MainWindow = new Lang.Class({
             );
         }
 
-        this._stack.connect("notify::visible-child", this._onNotifyMode);
-
+        this._onNotifyModelId = this._stack.connect("notify::visible-child", this._onNotifyMode);
+        this.connect("destroy",Lang.bind(this, function(){
+            this._stack.disconnect(this._onNotifyModelId);
+        }));
+  
         this.views[0].populate();
         }
         //To revert to the No Music View when no songs are found