fix checking whether a block of cells is empty

The GetEmptyLinesInBlock() call has unclear semantics and it appears
that it has an off-by-one error. Use a simple clear function
for the check.

Change-Id: I45d9b73428aedababc1ad93c202daa1de945b5bf
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/133303
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

0 files changed, 0 insertions, 0 deletions