Angular service hides GraphQL errors

The code just ignores the GraphQL response errors and returns the data (which will be null):
https://github.com/aws-amplify/amplify-codegen/blob/8c78e9737af95febf1f4dfe83077068d8497744b/packages/graphql-types-generator/src/angular/index.ts#L225

So using this library there is no way to access the errors array.