This is private for now. It's very handy to have anonymous properties
for the QML model/delegate adaptors. There are models with only
"singular" model data that doesn't have any sub-properties. Such model
data should be available from the model object via an empty string as
role. This way we can get rid of a lot of special casing.
Task-number: QTBUG-104752
Change-Id: I229e355a7cab064ee1c9f89557bc0244a5d0c90a
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
566e5e1acf