Validation for compound fields

[mstn]

For example, total is AmountInput

input Order {
total: AmountInput!
}

At the moment it fails silently, because total is not a field and redux-form does not seem to apply validation rules to field sections. Need further investigations.

If total is required, it should be at least the empty object {}. It should not require that all the subfields are required, but only those actually required.