[gnome-shell] notificationDaemon: Avoid access to undefined property

[Florian Müllner <fmuellner src gnome org>]

commit d815c5dfc04a1fe400a32c29eada880d3d6f8568
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Jun 13 06:49:07 2017 +0200

    notificationDaemon: Avoid access to undefined property
    
    Avoid a warning when assigning from an undefined property by making
    sure to pass a proper null value instead.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781471

 js/ui/notificationDaemon.js |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/notificationDaemon.js b/js/ui/notificationDaemon.js
index 315bfdb..c8cba60 100644
--- a/js/ui/notificationDaemon.js
+++ b/js/ui/notificationDaemon.js
@@ -186,7 +186,8 @@ const FdoNotificationDaemon = new Lang.Class({
             return source;
         }
 
-        source = new FdoNotificationDaemonSource(title, pid, sender, ndata ? ndata.hints['desktop-entry'] : 
null);
+        let appId = ndata ? ndata.hints['desktop-entry'] || null : null;
+        source = new FdoNotificationDaemonSource(title, pid, sender, appId);
 
         this._sources.push(source);
         source.connect('destroy', Lang.bind(this, function() {