[gnome-shell] modalDialog: Fix invalid argument 'timestamp' for pushModal

[Florian Müllner <fmuellner src gnome org>]

commit a23b293fe2d1b0bb4921ef63b62a19672e98b833
Author: Heiher <r hev cc>
Date:   Wed Jan 22 10:39:52 2014 +0800

    modalDialog: Fix invalid argument 'timestamp' for pushModal
    
    https://bugzilla.gnome.org/show_bug.cgi?id=722752

 js/ui/modalDialog.js |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/js/ui/modalDialog.js b/js/ui/modalDialog.js
index 960e0dc..ac77305 100644
--- a/js/ui/modalDialog.js
+++ b/js/ui/modalDialog.js
@@ -259,7 +259,7 @@ const ModalDialog = new Lang.Class({
         if (this.state == State.OPENED || this.state == State.OPENING)
             return true;
 
-        if (!this.pushModal({ timestamp: timestamp }))
+        if (!this.pushModal(timestamp))
             return false;
 
         this._fadeOpen(onPrimary);
@@ -318,8 +318,11 @@ const ModalDialog = new Lang.Class({
     pushModal: function (timestamp) {
         if (this._hasModal)
             return true;
-        if (!Main.pushModal(this._group, { timestamp: timestamp,
-                                           actionMode: this._actionMode }))
+
+        let params = { actionMode: this._actionMode };
+        if (timestamp)
+            params['timestamp'] = timestamp;
+        if (!Main.pushModal(this._group, params))
             return false;
 
         this._hasModal = true;