sudo gedit /etc/ssh/sshd_config modify as follow PermitEmptyPasswords yes
sudo sed -i ‘s/nullok_secure/nullok/‘ /etc/pam.d/common-auth
sudo service ssh restart
One more thing that I need to remind is that you have to create a user without password you can use this command to delete the password of a account to make it empty sudo adduser xxxx sudo passwd -d xxxx
