[gnome-shell] AltTabSwitcherPopup: check the number of items after creating the popup child

[Giovanni Campagna <gcampagna src gnome org>]

commit f3b7f61e54c2cc88326786ade1acf03eff3968f6
Author: Sebastien Lafargue <slaf66 gmail com>
Date:   Fri Oct 25 19:02:59 2013 +0200

    AltTabSwitcherPopup: check the number of items after creating the popup child
    
    The popup can be empty if the alt-tab switcher is configured
    in workspace-only mode, even if there are applications running.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=710745

 js/ui/altTab.js |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/altTab.js b/js/ui/altTab.js
index 779ae7b..b39cc81 100644
--- a/js/ui/altTab.js
+++ b/js/ui/altTab.js
@@ -106,6 +106,8 @@ const AppSwitcherPopup = new Lang.Class({
 
         this._switcherList = new AppSwitcher(apps, this);
         this._items = this._switcherList.icons;
+        if (this._items.length == 0)
+            return false;
 
         return true;
     },
@@ -375,6 +377,9 @@ const WindowSwitcherPopup = new Lang.Class({
         this._switcherList = new WindowList(windows, mode);
         this._items = this._switcherList.icons;
 
+        if (this._items.length == 0)
+            return false;
+
         return true;
     },