Fails with commit ac27f4e7 (tdf#117137:
DOCX import: don't try to set grab-bag as UNO prop, 2018-04-21)
reverted.

Change-Id: Ice5f9831234ba7ba72a730ea6e33648a339a2a88
Reviewed-on: https://gerrit.libreoffice.org/62998Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins