deleteAllEmptyDescriptionCards

gistfile1.txt

var created = new Notification(notification).createdCard();
var list_name_to_clear = "PUT YOUR LIST NAME HERE";

if(!created.name() == "DELETE EMPTY DESCRIPTIONS")
  throw new InvalidActionException("Not interested in created cards that don't tell us to delete descriptions");

created.board().cards().each(function(card)
{
  if(!card.description().trim())
    card.archive();
});