the SDK will crash if the batch response returns an error if one or more of the batch requests fail

[Nidal-Bakir]

New Issue Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am not just asking a question.
• [x] I have searched through existing issues.
• [x] I can reproduce the issue with the latest version of Parse Server and the Parse Flutter SDK.

Issue Description

When sending the batch request if the server returns an error for one or more batch requests the SDK will crash with the error" type 'Null' is not a subtype of type 'int'

Steps to reproduce

1. create ParseObject planObject
2. set objectId to any value so the server will return 101 not found error
3. create ParseObject dietPlansObject
4. set the planObject object as a child object for dietPlansObject object
5. call save() on the container object dietPlansObject

 final planObject = ParseObject('Plans')
          ..objectId = "000000" // so the server will return 101 not found error
          ..set('PlanName', 'plan 1');

 final dietPlansObject = ParseObject("Diet_Plans");

 dietPlansObject.set('Plan1', planObject);

 await dietPlansObject.save();

Actual Outcome

Error type 'Null' is not a subtype of type 'int'

Expected Outcome

The container object and its child object to be saved

Environment

Parse Flutter SDK

• SDK version: 4.0.0
• Operating system version: any

Server

• Parse Server version: any

Logs

package:parse_server_sdk/src/objects/response/parse_response_builder.dart 76:35 _ParseResponseBuilder._handleSuccess package:parse_server_sdk/src/objects/response/parse_response_builder.dart 29:14 _ParseResponseBuilder.handleResponse package:parse_server_sdk/src/objects/response/parse_response_utils.dart 8:31 handleResponse package:parse_server_sdk/src/utils/parse_utils.dart 97:12 batchRequest ===== asynchronous gap =========================== package:parse_server_sdk/src/objects/parse_object.dart 185:40 ParseObject._saveChildren ===== asynchronous gap =========================== package:parse_server_sdk/src/objects/parse_object.dart 112:44 ParseObject.save ===== asynchronous gap =========================== test/src/objects/parse_object/parse_object_save_test.dart 404:26 main..

type 'Null' is not a subtype of type 'int'

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[mtrezza]

I unassigned this issue from you. We deliberately do not make use the assignment feature.