Add a check if the backpack is empty on die()

This will handle an empty backpack, it looks better when you see a message saying there was nothing in the backpack instead of just having a newline.
Merge branch 'development' of git://github.com/blackwolf12333/JAdventure into blackwolf12333-development
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/blackwolf12333/JAdventure