bin/map: Moved string-cleanup code from get_value() to cleanup(), called by process_row(). process_row() now cleans up the string before checking if it's None, because cleanup() uses none_if() to map "" to None.
bin/map: Moved string-cleanup code from get_value() to cleanup(), called by process_row(). process_row() now cleans up the string before checking if it's None, because cleanup() uses none_if() to map "" to None.