If a required variable is not set it returns the error and result as if the variable was zero state

[jonlundy]

query getThing($required: ID!){ thing(required: $required) { things and stuff } }
variables: {}

Expected Behaviour

{
	"data":null,
	"errors":[
		{
			"message":"must be defined",
			"path":["variable","required"]
		}
	]
}

Actual Behavior

{
	"data":null,
	"errors":[
		{
			"message":"must be defined",
			"path":["variable","required"]
		}
	]
}
{
	"data":{ /* data as if required was = 0 */ }
}

Minimal graphql.schema and models to reproduce

[jonlundy]

Possiple suspect:
https://github.com/99designs/gqlgen/blob/master/handler/graphql.go#L174