check that AddToTable can be done validly

Change-Id: I0ee69279e3bb1d9871feba17b908b8307f0ec5b4
(cherry picked from commit 43b39d3e47ffd179071732c0a8fc201c31b2bb46)
Reviewed-on: https://gerrit.libreoffice.org/10950
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>