Fix composite response structures

[domain@localhost:9990 /] /host=master/server-config=*:query(select=[name], where={status=STARTED})
{
    "outcome" => "success",
    "result" => [
        {
            "address" => undefined,
            "outcome" => undefined,
            "result" => {"name" => "server-one"}
        },
        {
            "address" => undefined,
            "outcome" => undefined,
            "result" => {"name" => "server-two"}
        },
        {
            "address" => undefined,
            "outcome" => undefined,
            "result" => undefined
        }
    ],
    "server-groups" => undefined
}