Loads the draft tree and the base version so Save can publish without a separate call.
A null base id does not mean "first version" when this rubric already has a
Published or Retired version. The base is then the highest of those, so the
publish is numbered from that version instead of 1.0.0.
Loads the draft tree and the base version so Save can publish without a separate call. A null base id does not mean "first version" when this rubric already has a Published or Retired version. The base is then the highest of those, so the publish is numbered from that version instead of 1.0.0.