By Matt Hladik For years, the New Orleans Saints were known for their explosive offenses. However, since Drew Brees retired, scoring has sometimes been a struggle for the Saints. It has been impossible so far today. The Saints have been shut out through the first three quarters against the Carolina Panthers. New Orleans trails its division rival 13-0 heading into the final stanza. In 20 games since the start of last season, the Saints have been shut out in the first half four times, which is the same amount of times they were shut out in the first half during Brees’ entire tenure as a starter …