Yes, it’s finally time to Go On.The 2012-13 TV season doesn’t officially begin for another week-and-a-half, but some new shows are already sneaking onto schedules. Tuesday night, for example, Matthew Perry’s new comedy Go On (9 p.m., NBC, Global), Guys With Kids (9:30 p.m., Global) and The New Normal (9:30, NBC/CTV) all air in their