MakeCollection helper assumes the item is a Collection when it could be a CollectionRef

[markpbaggett]

The MakeCollection helper assumes the kwargs will have an items property. If the kwargs have no items, the helper generates a Collection with an empty items property: items=[].

Expected behaviour:

In the case where there is no items property, I think a CollectionRef should be added with no items prop.

Observed behaviour:

The helper returns a object like this:

    {
      "id": "https://raw.githubusercontent.com/markpbaggett/static_iiif/main/collections/primeros-libros.json",
      "type": "Collection",
      "label": {
        "en": [
          "Primeros Libros"
        ]
      },
      "items": []
    }

Potential bug location(s):

The helper always passes the kwargs to the Collection class:
https://github.com/iiif-prezi/iiif-prezi3/blob/main/iiif_prezi3/helpers/make_collection.py#L14-L16

It seems like it should check for items and either set to Collection (if present) or CollectionRef if not.

Any other comments: