[gnome-packagekit] Be more careful when dealing with windows

[Richard Hughes <rhughes src gnome org>]

commit 798245b6891df540eeb443d2a8eb868c844d9c35
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jan 3 17:32:03 2013 -0500

    Be more careful when dealing with windows
    
    xids may be 0, and in that case, we don't have a window.
    
    Signed-off-by: Richard Hughes <richard hughsie com>

 src/gpk-dbus-task.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/gpk-dbus-task.c b/src/gpk-dbus-task.c
index 44348ae..c3522a8 100644
--- a/src/gpk-dbus-task.c
+++ b/src/gpk-dbus-task.c
@@ -3295,7 +3295,8 @@ gpk_dbus_task_set_exec (GpkDbusTask *dtask, const gchar *exec)
 	dtask->priv->parent_icon_name = NULL;
 
 	/* is the binary trusted, i.e. can we probe it's window properties */
-	if (gpk_dbus_task_path_is_trusted (exec)) {
+	if (gpk_dbus_task_path_is_trusted (exec) &&
+            dtask->priv->parent_window != NULL) {
 		g_debug ("using application window properties");
 		/* get from window properties */
 		x11 = gpk_x11_new ();