Fix handling of empty worksheet in Belgian bank download
Fix handling of empty worksheet in Belgian bank download

LGTM alert: Call to next() in a generator
See: https://lgtm.com/rules/11000086/
Closes https://github.com/arthurdejong/python-stdnum/pull/270

arthurdejong/python-stdnum,arthurdejong/python-stdnum,arthurdejong/python-stdnum