[FIX] auth_signup: fix b2c signup

Rather than requiring the user have a name *or* a partner, the check
required the user have a name *and* a partner. The B2C form only has a
name and expects the partner to be created from/via the user, so this
would raise an exception which wouldn't even be bubbled to the user, so
trying to signup would just yield a 500 Server Error when trying to
create an account.

addons/auth_signup/models/res_users.py

@@ -92,7 +92,7 @@ class ResUsers(models.Model):
 
         if not values.get('login'):
             raise ValueError(_('Signup: no login given for new user'))
-        if not values.get('partner_id') or not values.get('name'):
+        if not values.get('partner_id') and not values.get('name'):
             raise ValueError(_('Signup: no name or partner given for new user'))
 
         # create a copy of the template user (attached to a specific partner_id if given)