fix baseline return

server.py

@@ -74,7 +74,8 @@ def create_app() -> Flask:
                 if result:
                     return jsonify(result), 200
                 else:
-                    return jsonify({"error": "Failed to retrieve visa information"}), 500
+                    return jsonify({"error": "Failed to retrieve visa information"}), 404
+        return jsonify({"error": "Unexpected error"}), 500
     
     @app.route('/', methods=['GET'])
     def hello_world():