[FIX] auth_brute_force: Don't execute migration script on install

auth_brute_force/migrations/10.0.2.0.0/pre-migrate.py

@@ -6,6 +6,8 @@ from psycopg2 import IntegrityError
 
 
 def migrate(cr, version):
+    if not version:
+        return
     # Fix typo across DB
     cr.execute(
         """ UPDATE res_authentication_attempt