Otherwise a formula like "_xludf.(SUM(A1:A2))", ie. user-defined without a name can be exported to XLSX, which is invalid. Adapt fix in 06c4bf867de38be2e65e1813ed1a1f05b0b49b4a after 996ee806764dd7cc0a24b1b218b3cf4cefd50db1. Affected eg. forum-mso-de-49320.xls Change-Id: I6d02d6e5b82ca851ca9569d324c4e4c60f3da919 Signed-off-by: Aron Budea <aron.budea@collabora.com> Reviewed-on: https://gerrit.collaboraoffice.com/c/online/+/7402 Reviewed-by: Noel Grandin <noel.grandin@collabora.com> Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com> Tested-by: Jenkins CPCI <releng@collaboraoffice.com> (cherry picked from commit a5ee7ceb3da75e0ae2aa739d612a0d0fc6eaf218) Reviewed-on: https://gerrit.libreoffice.org/c/core/+/208732 Tested-by: Jenkins Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>