the autosave file might be deleted by the user after it is created the first time but before the file is actually saved. guard against that.
the autosave file might be deleted by the user after it is created
the first time but before the file is actually saved. guard against that.

closes PR 12698

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket