[FIX] base: default value in set_multi

Make sure to test `None` instead of any falsy value. Indeed, when we
want to explicitly pass a `False` default value, `set_multi` might
select an incorrect default value.

This is for example the case of `_inverse_product_pricelist`, where
`default_for_country` might be `False` on purpose.

opw-1858271

odoo/addons/base/res/ir_property.py

@@ -188,7 +188,7 @@ class Property(models.Model):
         if not values:
             return
 
-        if not default_value:
+        if default_value is None:
             domain = self._get_domain(name, model)
             if domain is None:
                 raise Exception()