avoids !!br0ken!! in svg output

Change-Id: I7f99a26f3a995cbaeb1e520a411a8e1c31a8a61f
Reviewed-on: https://gerrit.libreoffice.org/15144Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>