do not die if the app configuration is not found

server/djrandom/frontend/frontend.py

@@ -50,7 +50,7 @@ def run_frontend(opts):
             )
 
     # Set some configuration options in the Flask global config.
-    app.config.from_pyfile(opts.app_config)
+    app.config.from_pyfile(opts.app_config, silent=True)
 
     http_server = WSGIServer((opts.bind_address, opts.port), app)
     http_server.serve_forever()