[gnome-shell] keyboard: _showLayoutItem is only defined if allowSettings.

[Giovanni Campagna <gcampagna src gnome org>]

commit 9082b4df48ef127cc16e32edcb0cfd9fc05c9a46
Author: Alban Browaeys <prahal yahoo com>
Date:   Fri Aug 3 03:28:32 2012 +0200

    keyboard: _showLayoutItem is only defined if allowSettings.
    
    Check Main.sessionMode.allowSettings is true before accessing the
    actor item of _showLayoutItem.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=681101

 js/ui/status/keyboard.js |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/status/keyboard.js b/js/ui/status/keyboard.js
index 4a3fdc7..900c81c 100644
--- a/js/ui/status/keyboard.js
+++ b/js/ui/status/keyboard.js
@@ -178,7 +178,9 @@ const InputSourceIndicator = new Lang.Class({
     },
 
     setLockedState: function(locked) {
-        this._showLayoutItem.actor.visible = !locked;
+        if (Main.sessionMode.allowSettings) {
+            this._showLayoutItem.actor.visible = !locked;
+        }
         this.menu.setSettingsVisibility(!locked);
     },