[FIX] stock: Error if warehouse_id is given to the form view

If the developer wants to give warehouse_id form view, when create new
location, there will be an error in the compute function because it use
function split() with field parent_path has no value

closes odoo/odoo#115103

X-original-commit: 4d9b2ec6c85a178898bd81fe45bb0fcd3ba1a901
Signed-off-by: William Henrotin (whe) <whe@odoo.com>

addons/stock/models/stock_location.py

@@ -152,6 +152,8 @@ class Location(models.Model):
         view_by_wh = OrderedDict((wh.view_location_id.id, wh.id) for wh in warehouses)
         self.warehouse_id = False
         for loc in self:
+            if not loc.parent_path:
+                continue
             path = set(int(loc_id) for loc_id in loc.parent_path.split('/')[:-1])
             for view_location_id in view_by_wh:
                 if view_location_id in path: