[FIX] portal: bad ensure_one due to migration

addons/portal/wizard/portal_wizard.py

@@ -120,7 +120,6 @@ class PortalWizardUser(models.TransientModel):
         """ From selected partners, add corresponding users to chosen portal group. It either granted
             existing user, or create new one (and add it to the group).
         """
-        self.ensure_one()
         error_msg = self.get_error_messages()
         if error_msg:
             raise UserError("\n\n".join(error_msg))
@@ -139,7 +138,7 @@ class PortalWizardUser(models.TransientModel):
                 # create a user if necessary, and make sure it is in the portal group
                 if not user:
                     company_id = wizard_user.partner_id.company_id.id
-                    user_portal = self.sudo().with_context(company_id=company_id)._create_user()
+                    user_portal = wizard_user.sudo().with_context(company_id=company_id)._create_user()
                 else:
                     user_portal = user
                 wizard_user.write({'user_id': user_portal.id})