Update commands.py
Update commands.py

updates fix that will cause an error if empty file

https://github.com/botherder/viper/issues/50
cwtaylor/viper,S2R2/viper,S2R2/viper,Beercow/viper,rommelfs/viper,MeteorAdminz/viper,rommelfs/viper,jorik041/viper,jorik041/viper,kevthehermit/viper,jahrome/viper,Beercow/viper,jahrome/viper,postfix/viper-1,cwtaylor/viper,postfix/viper-1,MeteorAdminz/viper,kevthehermit/viper,Beercow/viper,jack51706/viper,jack51706/viper