Hartford Stage will return to live performance in October after being shuttered for nearly a year and a half, with an “optimistic” season of classics (“Ah, Wilderness!,” “It’s a Wonderful Life,” “Lost in Yonkers”), the new play-with-percussion “Dishwasher Dreams” and the issue-laden comedy “Angry, Raucous and Shamelessly Gorgeous.” But for some, the list may be most notable for what’s not on it. .