...that could cause infinite recursion, e.g. when an erroneously modified
/org.openoffice.ucb.Hierarchy/Entry template (which recursively has children of
the same template type) is later used to instantiate a new set member.

Change-Id: I7b9e55fa1c92979aed98b9f23f4432600afffed4
Reviewed-on: https://gerrit.libreoffice.org/54024Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit 193d244e)