Related: fdo#77720 Writer crashes when running Mail Merge Wizard

Change-Id: I02695420ff4f54ad15b077ab1d16f27ff684e5da
Reviewed-on: https://gerrit.libreoffice.org/9111
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>