GraphQl returns null on empty properties


I’m trying to migrate my queries to GraphQL. I’ve setup Rules, Schemas and relations and everything seems to work fine, except on documents that have some empty properties, in this case I’m receiving null.
I’m wonder if I there is a way to GraphQL ignore empty values and instead of returning null, don’t return the whole property?
GraphQL uses ! after primitive type to ignore those values, eg: “address: string!”, but how to implement this with json schema?

Kind regards,
Rui Cruz