Add an ODS roundtrip test for histogram chart ODF import/export. Change-Id: I37e6da4fc55dbff1fa0d310b3f74ee7e63a8012d (cherry picked from commit 8a04469f2577c8a817dd4c9a9ee5c2d971157e4f) Signed-off-by: Devansh Varshney <varshney.devansh614@gmail.com> Reviewed-on: https://gerrit.collaboraoffice.com/c/online/+/1881 Reviewed-by: Tomaž Vajngerl <tomaz.vajngerl@collabora.com> Tested-by: Jenkins CPCI <releng@collaboraoffice.com> (cherry picked from commit 74bb1558fdf2e418d1c4a556e5a69819e3696cdd) Reviewed-on: https://gerrit.libreoffice.org/c/core/+/203893 Tested-by: Jenkins Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>