Remove empty lines in xlsx2tabby

[mslw]

I was working with excel files that were sent to me, and noticed in some cases that tabby-many tsv files produced by xlsx2tabby had some empty lines (i.e. delimiters only). In one case it was just two extra lines, but in another a file had 1 048 576 lines while it should have had 4. This later caused load_tabby to hang.

I can share the file privately, but in general I suppose this can happen when formatting has been applied in a particular way in excel / libre office. And FTR, such a file can be sanitized with sed -i '/^\s*$/d' <filename>, so it's not that big of a deal.

Should xlsx2tabby strip such empty lines?