Smithers said:
Completely removing Yoda as a character from the PT, but leaving an empty chair in his place, he actually doesn't contribute much to the story and most of the time just rephrases what the other Jedi had just said.
While I agree that he doesn't actually contribute much to the story, Yoda not being there doesn't make any sense in my opinion. Also, I believe some scenes wouldn't work without Yoda there.