mason.release.tidy: don't die if file doesn't exist
mason.release.tidy: don't die if file doesn't exist

nicolas-p/factor,AlexIljin/factor,mrjbq7/factor,dch/factor,mrjbq7/factor,bjourne/factor,nicolas-p/factor,factor/factor,sarvex/factor-lang,mrjbq7/factor,AlexIljin/factor,bjourne/factor,slavapestov/factor,AlexIljin/factor,bpollack/factor,nicolas-p/factor,bjourne/factor,factor/factor,tgunr/factor,dch/factor,tgunr/factor,sarvex/factor-lang,slavapestov/factor,slavapestov/factor,tgunr/factor,dch/factor,tgunr/factor,nicolas-p/factor,bpollack/factor,factor/factor,dch/factor,nicolas-p/factor,bjourne/factor,slavapestov/factor,nicolas-p/factor,sarvex/factor-lang,bpollack/factor,mrjbq7/factor,bjourne/factor,factor/factor,nicolas-p/factor,dch/factor,slavapestov/factor,mrjbq7/factor,mrjbq7/factor,AlexIljin/factor,bpollack/factor,sarvex/factor-lang,tgunr/factor,AlexIljin/factor,factor/factor,bjourne/factor,tgunr/factor,AlexIljin/factor,bpollack/factor,slavapestov/factor,bpollack/factor,slavapestov/factor,sarvex/factor-lang,bpollack/factor,factor/factor,dch/factor,sarvex/factor-lang,AlexIljin/factor,bjourne/factor,sarvex/factor-lang