c# parse json value, check if null

So I have this Web API that calls a service which in turn, returns a json string. The string looks a bit like this:

{
    "title": "Test",
    "slug": "test",
    "collection":{  },
    "catalog_only":{  },
    "configurator":null
}

I have cut this down considerably to make it easier to see my issue.

When I make my API call, I then use a Factory method to factorize the response which looks something like this:

    /// <summary>
    /// Used to create a product response from a JToken
    /// </summary>
    /// <param name="model">The JToken representing the product</param>
    /// <returns>A ProductResponseViewModel</returns>
    public ProductResponseViewModel Create(JToken model)
    {

        // Create our response
        var response = new ProductResponseViewModel()
        {
            Title = model["title"].ToString(),
            Slug = model["slug"].ToString()
        };

        // Get our configurator property
        var configurator = model["configurator"];

        // If the configurator is null
        if (configurator == null)
            throw new ArgumentNullException("Configurator");

        // For each item in our configurator data
        foreach (var item in (JObject)configurator["data"])
        {

            // Get our current option
            var option = item.Value["option"].ToString().ToLower();

            // Assign our configuration values
            if (!response.IsConfigurable) response.IsConfigurable = (option == "configurable");
            if (!response.IsDesignable) response.IsDesignable = (option == "designable");
            if (!response.HasGraphics) response.HasGraphics = (option == "graphics");
            if (!response.HasOptions) response.HasOptions = (option == "options");
            if (!response.HasFonts) response.HasFonts = (option == "fonts");
        }

        // Return our Product response
        return response;
    }
}

Now, as you can see I am getting my configurator property and then checking it to see if it's null. The json string shows the configurator as null, but when I put a breakpoint on the check, it actually shows it's value as {}. My question is how can I get it to show the value (null) as opposed to this bracket response?