[MIG] document_page_reference: Migration to 17.0

[FIX]document_page_reference :log warning updated

[FIX]document_page_reference: null value issue fixed

Co-authored-by: Anusha <anusha.pp@calin.co.in>

document_page_reference/migrations/17.0.1.0.0/post-migration.py

@@ -0,0 +1,12 @@
+# Copyright 2025 Tecnativa - Víctor Martínez
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+import re
+
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    for item in env["document.page"].search([("content", "ilike", "${")]):
+        item.content = re.sub(r"\${(.+)}", r"{{\1}}", item.content)