Tomaz Canabrava 11fc888cdc Fix moving columns around when one of the columns is empty
I used to compare strings, but since there can be more than one empty
column, this was a very sad choice, now I'm comparing indexes.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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