[ADD] base/0.0.0: fix NULL commercial_partner_id

The `commercial_partner_id` field is expected to always be set.
Although the column is not marked as `NOT NULL`.
Fight the Murphy's Law, and recompute the value on records with
a NULL value.

Author: KangOl

src/base/0.0.0/post-commercial_partner_id.py

@@ -0,0 +1,10 @@
+# -*- coding: utf-8 -*-
+from odoo.addons.base.maintenance.migrations import util
+
+
+def migrate(cr, version):
+    # The `commercial_partner_id` field is expected to always be set. Although the column is not marked as `NOT NULL`.
+    # Fight the Murphy's Law, and recompute the value on partners with a NULL value.
+    cr.execute("SELECT id FROM res_partner WHERE commercial_partner_id IS NULL")
+    if cr.rowcount:
+        util.recompute_fields(cr, "res.partner", ["commercial_partner_id"], ids=[id_ for id_, in cr.fetchall()])