Robbie Montgomery worked the last day at Sweetie Pie’s Upper Crust like it was any other day: in the kitchen, watching over every platter of her famous fried chicken. “I’m a hands-on person,” Montgomery, 82, said Sunday shortly before she was surrounded by patrons eager for a hug and photo. “And if it’s not right I’m not going to send it out.” Patrons lined up down the block for hours Sunday to get one last plate — and to-go bag — of Montgomery’s down-home soul food cooking. The closure of the c