output error message if unlock address is invalid (fixes the wierd "read /path: is a directory") msg
output error message if unlock address is invalid (fixes the wierd "read /path: is a directory") msg

maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum,maran/go-ethereum