title: Bug on create address on opc-order (Prestashop 1.5)
body: <p>On Prestashop 1.5 when I'm creating a customer on One page Checkout order</p>
  
  <p>I put all data on delivery fields, allright.</p>
  
  <p>When I need another address for invoice I was clicked checkbox.</p>
  
  <p>If I miss some data of Invoice Address and I submit this Prestashop don't shows me an error with the data missed to fill, displays an ajax error "unable to save address", but the customer and the address was created!!!</p>
  
  <p>How can I fix this? Thanks </p>