link to model code needs to use href: "some string"

[valentinedwv]

to Radiant Earth

now generates:

{
      "rel": "item",
      "href": [],
      "type": "text/html",
      "title": "Link for Model Code"
    }

should not generate an asset, or may point to example.com

{
      "rel": "item",
      "href": "https://github.com/radiantearth",
      "type": "text/html",
      "title": "Link for Model Code"
    }

or no item...

[ylyangtw]

close as it's fixed