for user-defined (!preset) gradients. ODF doesn't cope with nameless
gradients so well ...

Change-Id: I7a4ca32ccf58b22fc55ceeac8778029cd6d5cea3
Reviewed-on: https://gerrit.libreoffice.org/34001Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>