Your call but it is absolutely not necessary on a stout since the reasons for secondary are #1: to help the beer clear #2: to age the beer before packaging #3: to free up a fermenter for another batch.
I have a dry Irish Stout in my fermenters now (11 gallons) and it will be bottled after 21 days in the primary and then bottle conditioned for 5 weeks and ready on St. Patty's day!