[gnome-shell] Keyboard: clear currentSource after destruction

[Giovanni Campagna <gcampagna src gnome org>]

commit aef70152de8a2a7b5a8b558514566a7f6cd3746b
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Wed Apr 24 21:38:00 2013 +0200

    Keyboard: clear currentSource after destruction
    
    StLabel doesn't like that we set its properties after destructions,
    and this would happen in currentInputSourceChanged() at the end,
    when setting the ornament.

 js/ui/status/keyboard.js |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/status/keyboard.js b/js/ui/status/keyboard.js
index 28e5b86..4880fd2 100644
--- a/js/ui/status/keyboard.js
+++ b/js/ui/status/keyboard.js
@@ -459,6 +459,7 @@ const InputSourceIndicator = new Lang.Class({
 
         this._inputSources = {};
         this._ibusSources = {};
+        this._currentSource = null;
 
         let inputSourcesByShortName = {};