ra-data-graphql: Missing original error as body in handleError

[hlubek]

What you were expecting:

When mutations fail, the specific error (HttpError body) should be accessible like shown in https://marmelab.com/react-admin/CreateEdit.html#submission-validation

What happened instead:

The HttpError body is not set.

Steps to reproduce:

• Create new project
• Add ra-data-gaphql data provider
• Implement submission validation like shown in https://marmelab.com/react-admin/CreateEdit.html#submission-validation
• error.body is not set and thus errors cannot be accessed

Environment

• React-admin version: 3.19.2