two condensate drains?
No, probably not. The reason there are two lines is in case one gets clogged up, the second one will be used as a backup.  

The reason for the backup line is if the unit is in the house, you absolutely don't want a clog in one drain line to cause water to drip out of the unit and get all over your house.  Since it is in the garage though, it probably just doesn't matter much if you get water on the garage floor.  Which is probably why the installer didn't bother installing a backup line (which it sounds like just drained onto the floor anyways)