[gnome-shell] keyring: Fix button disabled when prompting for confirmation

[Stefan Walter <stefw src gnome org>]

commit 12a1d7b38d9a150d0dea8a0ca8e018a72dd1c5c5
Author: Stef Walter <stefw gnome org>
Date:   Wed Apr 17 12:02:12 2013 +0200

    keyring: Fix button disabled when prompting for confirmation
    
    https://bugzilla.gnome.org/show_bug.cgi?id=696304

 js/ui/components/keyring.js |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/components/keyring.js b/js/ui/components/keyring.js
index b38888f..ae67b55 100644
--- a/js/ui/components/keyring.js
+++ b/js/ui/components/keyring.js
@@ -143,8 +143,15 @@ const KeyringDialog = new Lang.Class({
     },
 
     _updateSensitivity: function(sensitive) {
-        this._passwordEntry.reactive = sensitive;
-        this._passwordEntry.clutter_text.editable = sensitive;
+        if (this._passwordEntry) {
+            this._passwordEntry.reactive = sensitive;
+            this._passwordEntry.clutter_text.editable = sensitive;
+        }
+
+        if (this._confirmEntry) {
+            this._confirmEntry.reactive = sensitive;
+            this._confirmEntry.clutter_text.editable = sensitive;
+        }
 
         this._continueButton.can_focus = sensitive;
         this._continueButton.reactive = sensitive;