bug error in logout when timeout reached

cao_sunyata/views/default.py

@@ -172,11 +172,14 @@ def login(request):
 
 @view_config(route_name='logout', renderer='string')
 def logout(request):
+    username = request.authenticated_userid
+    if username == None:
+        username = ''
+    
     headers = forget(request)
-    request.session.flash('Vous avez bien été déconnecté.', 'success')
+    request.session.flash('Au revoir ' + username + ' !', 'success')
     return HTTPFound(location=request.route_url('home'), headers=headers)
 
-
 @view_config(route_name='users', renderer='cao_sunyata:templates/users.jinja2', permission='manage')
 def users(request):
     # get all users