"Bad" lines with too few fields
As per http://pandas.pydata.org/pandas-docs/stable/io.html#handling-bad-lines, records with too many fields cause (depending on error_bad_lines) an exception to be thrown, or stderr to be written to.

Would it be possible to add an option, defaulting to False, that gave similar warnings/errors if there are _too few_ fields in a record (compared to all the other records. The current behaviour is just to insert NaN's - but there are cases where data integrity is important so knowing that some records are missing fields is important.

Cheers ^
