HypermediaQuery and Steps

[kenyamat]

As the representor (HypermediaRepresentation) in HypermediaQuery.ExecuteAsync is set null before looping through Steps, ArgumentNullException will be thrown when NavigateToRelativeUrlQueryStep is included in first Steps,
https://github.com/edandersen/Edsoft.Hypermedia/blob/develop/src/Edsoft.Hypermedia.Client/HypermediaQuery.cs#L33-L39

var client = new HypermediaClient(new Uri(args[0]), new HalSerializer());
var query = client.CreateQuery().WithUrl(args[1]);
var result = client.ExecuteQueryAsync(query).Result; // ArgumentNullException will be thrown

Please review whether we need code changes or not.