[rrd4j] rrd files are created for not persisted items when doing a REST call.

[JueBag]

Should a REST call for Persistence/Items/{itemname} on an item that is not persisted create a .rrd file?
I observed that such files are created when performing the above REST call on items and groups although neither is setup to be persisted.
I'm not sure if such behaviour is expected nor if it could be observed in other persistence services.

Using it from an OH 2.4 (stable release) installation.