Justin Bieber addresses weed pics, serenades Whoopi Goldberg on SNL

When in doubt, sing. Justin Bieber’s voice, abs, dance moves – and wink – carried this weekend’s episode of “Saturday Night Live,” a 90-minute celebration of all things Bieber. The episode could stand as a suitable comedy-laced sequel to his 3-D concert film “Never Say Never.” Bieber, 18, hosted and…