Reanalyze error recovery method fails on single-token records.

[goodmami]

The errors='reanalyze' argument to align_fields() iteratively breaks up and aligns things by going through nested delimiters (e.g. first by space, then by r'[-=~]', then by r'.'`) but it only goes to the next level if the current level resulted in a split. This fails for single-token records, because there are no spaces to split on.