[FIX] mass_mailing_partner: get contextual list when importing contacts

When importing contacts from csv or xls, the list is set by context. So
we must try to default to that context when setting the contact values.

mass_mailing_partner/models/mail_mass_mailing_contact.py

@@ -38,18 +38,25 @@ class MailMassMailingContact(models.Model):
             if category_ids:
                 self.tag_ids = category_ids
 
-    @api.model
-    def create(self, vals):
-        record = self.new(vals)
+    @api.model_create_multi
+    def create(self, vals_list):
+        new_vals_list = []
+        for vals in vals_list:
+            # Ensure that defaults are loaded (e.g.: import csv or xls)
+            values_w_defaults = self.default_get(self._fields.keys())
+            values_w_defaults.update(vals)
+            record = self.new(values_w_defaults)
             if not record.partner_id:
                 record._set_partner()
             record._onchange_partner_mass_mailing_partner()
             new_vals = record._convert_to_write(record._cache)
             new_vals.update(
-            subscription_list_ids=vals.get('subscription_list_ids', False),
-            list_ids=vals.get('list_ids', False)
+                subscription_list_ids=values_w_defaults.get(
+                    'subscription_list_ids', False),
+                list_ids=values_w_defaults.get('list_ids', False)
             )
-        return super(MailMassMailingContact, self).create(new_vals)
+            new_vals_list.append(new_vals)
+        return super().create(new_vals_list)
 
     def write(self, vals):
         for contact in self:
@@ -63,7 +70,7 @@ class MailMassMailingContact(models.Model):
                 subscription_list_ids=vals.get('subscription_list_ids', False),
                 list_ids=vals.get('list_ids', False)
             )
-            super(MailMassMailingContact, contact).write(new_vals)
+            super().write(new_vals)
         return True
 
     def _get_company(self):