Entity view subfetching creates empty containers for unfetched collection attributes

[Mobe91]

Consider e.g. the following entity view:

public interface PrimitiveDocumentView {

    @IdMapping
    public long getId();

    @Mapping(fetch = FetchStrategy.SUBSELECT)
    public Map<Integer, PrimitivePersonView> getContacts();

}

When fetching this entity view we specify fetches that exclude contacts:

var setting = EntityViewSetting.create(PrimitiveDocumentView.class);
setting.fetch("id");
evm.applySetting(setting, cbf.create(em, PrimitiveDocument.class));

For fetched entity views getContacts() will return an empty map instead of null. This also happens for other collection mappings.

[Mobe91]

For fixing this we should turn the IndexedTupleListTransformer into an IndexedTupleListTransformerFactory which can access entity view setting metadata and thus can consider fetched entity view paths.