An option like that requires a confirmation message ie. proof that the action has been enabled. Unfortunately Avast's virus chest also has a similarly unhelpful GUI - when you click to Restore a file there's absolutely no confirmation that has been done. Only if you click it again does it tell you the file already exists.
If it wasn't safe, then you would have gotten a warning as to it being an infection of what ever kind. In this case, No news is good news and your file was restored. :) It all depends on how you look at it.