[meld] misc: Fix traceback when showing a parentless error dialog

[Kai Willadsen <kaiw src gnome org>]

commit 367b836d9a73e546daf8753782b333b7fecc6de9
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Mon Jun 9 08:37:23 2014 +1000

    misc: Fix traceback when showing a parentless error dialog

 meld/misc.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meld/misc.py b/meld/misc.py
index 4a353a7..3a48f72 100644
--- a/meld/misc.py
+++ b/meld/misc.py
@@ -52,7 +52,7 @@ def error_dialog(
     """
     if not parent:
         from meld.meldapp import app
-        parent = app.window.widget
+        parent = app.get_active_window()
 
     dialog = Gtk.MessageDialog(
         parent=parent,