Revisit bandaid to table.py

[pfuntner]

In 84d4fb6, I removed some code in order to process a certain type of input with separators properly. The problem seemed to be that the code was removing empty fields as each line was consumed. See the example in that commit.

I think I was trying to consume empty fields for borders when all lines have an empty leading and/or trailing empty field. This should be done in a separate pass after all the lines have been parsed into tokens.