SERIES FINALE: This Katherine Heigl series has been hiding in plain sight, as CBS has been burning off first-run episodes on Saturday nights all summer. Summer TV? Saturday night? That’s broadcast TV’s idea of an unwanted, unwatched gulag. If episodes of Doubt fall in a forest, and no one is tuned in to watch, did they really drop at all? At any rate, tonight CBS presents the season’s concluding two episodes back to back, which presumably include a verdict in the legal case that’s been dramatized all summer. Will this series, and this narrative, be back next season with fresh episodes? I Doubt it. In fact, it’s been officially canceled.