273ca99db0
A user may have cast a vote on a change (Code-Review+2), had the change submitted, and then lose their permission to that label in this context. Don't try to squash away labels on a closed change. Instead just bail early if there were no labels requested in the input and the change is already closed. Change-Id: I0be02ec5dc625250bed9a44d29d0dfc24fe4745a