we remove the posibility of setting 0 as user_id
we remove the posibility of setting 0 as user_id

I don't know how this helps, but is good to make sure if no id was passed or not.
benedmunds/CodeIgniter-Ion-Auth,avenirer/CodeIgniter-Ion-Auth,Tjoosten/CodeIgniter-Ion-Auth,avenirer/CodeIgniter-Ion-Auth,suhindra/CodeIgniter-Ion-Auth,avenirer/CodeIgniter-Ion-Auth,suhindra/CodeIgniter-Ion-Auth,nguyenanhnhan/CodeIgniter-Ion-Auth,Tjoosten/CodeIgniter-Ion-Auth,benedmunds/CodeIgniter-Ion-Auth,benedmunds/CodeIgniter-Ion-Auth,Tjoosten/CodeIgniter-Ion-Auth,suhindra/CodeIgniter-Ion-Auth,nguyenanhnhan/CodeIgniter-Ion-Auth,nguyenanhnhan/CodeIgniter-Ion-Auth