Queries do not enforce required parameters

[opomuc]

This query will be successfull:

query service_query_with_skip($uid: Long, $ignore: Boolean!) {
  services(uid: $uid) {
    uid
    p1
    p2 @skip(if: $ignore)
  }
}

"variables": { "uid": 1 }

Response

    "data": {
        "services": [
            {
                "p1": 123,
                "p2": 2,
                "uid": 1
            }
        ]
    },

[Totktonada]

Set prio1, because it blocks #134.