There is no reason to have an empty slot when dealing another batch of cards. However, when you have an empty slot, try to keep it empty as long as possible, as this is a great way to get rid of buried cards.
Kartak berriro banatzean, ez dago toki hutsak izateko inolako arrazoirik. Dena den, toki huts bat duzunean, saiatu horrela mantentzen ahalik eta luzaroen, traba egiten dizuten kartak jartzeko oso baliagarri izango baitzaizu.