...if you call ResetPoolDefaultItem() first. Crash found by Varun Dhall.

Change-Id: I409484c172fb5843270aee2425844076a008b4df
(cherry picked from commit bcb1f816)
Reviewed-on: https://gerrit.libreoffice.org/17320Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>