country_id of "Don" object is still empty

[rassakali]

Bug

When I use:

$object = new Don($db);
$object->fetch($id);
echo $object->country_id

country_id is still empty

Environment

• Version: [3.8.3]

problem cause

In the source "dolibarr/don/class/don.class.php" lines 648 there are:
$this->country_id = $obj->country_id;
but country_id not in the $sql query

Suggested implementation

the line 648 must be :
$this->country_id = $obj->fk_country;
OR
add country_id in $sql like that:
$sql.= " d.fk_country as country_id,....