Consider a data series as hidden if there is no unfiltered value, do not
consider data labels. It solves a regression introduced when working on
tdf#134059.
Change-Id: I6072bf469137d70e0aa353ffbeb0d0a1216ffa5f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/128476
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>