l10ntools/source/export.cxx: add sanity check to aOutput.mSimple
l10ntools/source/export.cxx: add sanity check to aOutput.mSimple

Change-Id: I05074760f189dfc00ce14ec33002609a56797a6d
Reviewed-on: https://gerrit.libreoffice.org/11321
Reviewed-by: Caolán McNamara <301f5784f9f6aac04077f24f1e5abc31af69d401@redhat.com>
Tested-by: Caolán McNamara <301f5784f9f6aac04077f24f1e5abc31af69d401@redhat.com>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core