Use request.app.auth instead of mg_globals

mediagoblin/auth/tools.py

@@ -184,7 +184,7 @@ def no_auth_logout(request):
     Log out the user if no authentication is enabled, but don't delete
     the messages
     """
-    if not mg_globals.app.auth and 'user_id' in request.session:
+    if not request.app.auth and 'user_id' in request.session:
         del request.session['user_id']
         request.session.save()