[IMP] odoo: avoid useless error in logs

Avoid logging an error in the logs for an operation that is not an

closes odoo/odoo#48957

Error: if the extension already exists, this is a success.
X-original-commit: 2f884942c94a640ae5107ff2acb27ba4ecc60bc0
Signed-off-by: Damien Bouvy (dbo) <dbo@odoo.com>

odoo/service/db.py

@@ -115,7 +115,7 @@ def _create_empty_database(name):
         try:
             db = odoo.sql_db.db_connect(name)
             with closing(db.cursor()) as cr:
-                cr.execute("CREATE EXTENSION unaccent")
+                cr.execute("CREATE EXTENSION IF NOT EXISTS unaccent")
                 cr.commit()
         except psycopg2.Error:
             pass