Former New York Gov.David Paterson was attacked by a trio of young suspects while walking on the Upper East Side on Friday night, law enforcement sources said.Paterson, 70, was with a 20-year-old man when they encountered a group of three young men, possibly teens, on Second Avenue near East 96th Street shortly before 9 p.m., the sources said.Some type of confrontation ensued and Paterson and the 20-year-old were assaulted by the group.The ex-governor and the young man sustained injuries to their face.They were taken to a local hospital to be treated, sources said.No arrests were made as of late Friday....