substreams require a Model and a DrawPage

Change-Id: I701cf6e2283f84f18b9a0c06a4ce0aa8be934bf3
Reviewed-on: https://gerrit.libreoffice.org/19951Reviewed-by: Oliver Specht <oliver.specht@cib.de>
Tested-by: Oliver Specht <oliver.specht@cib.de>
(cherry picked from commit f47bd056)
Reviewed-on: https://gerrit.libreoffice.org/19954Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>