Abandon empty password

src/freedombone-image-customise

 
 username=$MY_USERNAME
 echo $"warning: creating initial user $username with well known password!"
-if [[ $VARIANT == "meshclient" || $VARIANT == "meshusb" ]]; then
-	# on the mesh client don't use a password by default
-	MY_PASSWORD=''
-fi
 password=$MY_PASSWORD
 chroot "$rootdir" adduser --gecos $username --disabled-password $username
 echo $username:$password | chroot $rootdir /usr/sbin/chpasswd