The Replication Manager's add_member() method throws an exception when adding
the first object reference to a newly created object group.

From a email discussion with Bala and Dale, the root cause seems to be caused by
the replication manager removing the "dummy" profile from the IOGR before adding
the entry, and the IOGR code being updated to reject operations resulting in
invalid IOGRs.  Suggestions for fixing the problem included reversing the
operations to add the entry before removing the "dummy"; and/or providing a
remove_profile_unchecked() operation.

Since it's been a while since those discussions, I'm adding this so we don't forget.