[pitivi] startupwizard: Fix to cancel a loading project.

[Alexandru Băluț <alexbalut src gnome org>]

commit 1a5d37f9a720b6fe0029c6542b68b380ace537ca
Author: Fabian Orccon <fabian orccon pucp pe>
Date:   Tue Apr 5 00:23:01 2016 +0000

    startupwizard: Fix to cancel a loading project.
    
    Differential Revision: https://phabricator.freedesktop.org/D888

 pitivi/dialogs/startupwizard.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/dialogs/startupwizard.py b/pitivi/dialogs/startupwizard.py
index d447715..1647341 100644
--- a/pitivi/dialogs/startupwizard.py
+++ b/pitivi/dialogs/startupwizard.py
@@ -122,6 +122,7 @@ class StartUpWizard(object):
     def _deleteCb(self, unused_widget, unused_event):
         """Handle a click on the X button of the dialog."""
         self.app.project_manager.newBlankProject()
+        return True
 
     def show(self):
         if self.window.props.visible: