Invalid generated query: Expected Name, found }

[antoniopresto]

The code generation currently expects at least one simple field.

## invalid
  type PlacePositivatorsPayload {
    positivators: [Positivator]
    positivations: [PositivatorPlace]
  }
`

## valid
```graphql
  type PlacePositivatorsPayload {
    _idSimpleFieldFooBar: String
    positivators: [Positivator]
    positivations: [PositivatorPlace]
  }
`