i'm using csvkit to process emailed excel files, but i keep encountering xlsx files with null rows, and in2csv output bails when the null is encountered.
this patch is saving me grief, so i thought i'd offer it. i tried writing a test for it but got deep in weeds trying to replicate the bad xlsx content.
i haven't hit this issue (or been able to replicate it) with the older xls format.
fix allows in2csv to step over null rows in xlsx files
please disregard, and sorry for the churn. nulls were not the problem.