🐛 Bug Report: User object empty prefs field is an array instead of an object

### 👟 Reproduction steps When a `users.*.delete` event triggers a cloud function for a user that has empty preferences, the User object `prefs` is an array instead of an object. **Reproducible code** ```` Future<dynamic> main(final context) async { final client = Client() .setEndpoint(Platform.environment['APPWRITE_ENDPOINT']!) .setProject(Platform.environment['APPWRITE_FUNCTION_PROJECT_ID']) .setKey(Platform.environment['API_KEY']); try { final user = User.fromMap(context.req.body); await Databases(client).deleteDocument( databaseId: Platform.environment['DATABASE_ID']!, collectionId: Platform.environment['USERS_COLLECTION_ID']!, documentId: user.$id, ); return context.res.empty(); } on Exception catch (e, stack) { context.error('$e \n $stack'); return context.res.send('Server error', 500); } } ```` ### 👍 Expected behavior The User object from `context.req.body` should have `prefs:{}` ### 👎 Actual Behavior The User object from `context.req.body` has `prefs:[]` ### 🎲 Appwrite version Appwrite Cloud ### 💻 Operating system MacOS ### 🧱 Your Environment Appwrite 1.4 cloud functions runtime: dart 2.17.0 dart_appwrite: 8.0.0 ### 👀 Have you spent some time to check if this issue has been raised before? - [X] I checked and didn't find similar issue ### 🏢 Have you read the Code of Conduct? - [X] I have read the [Code of Conduct](https://github.com/appwrite/.github/blob/main/CODE_OF_CONDUCT.md)