message: fix: use IS NULL in the migration check
diff: @@ -1475,7 +1475,7 @@ CREATE OR REPLACE PROCEDURE
  e.openshift = p.openshift,
  e.openshift_project_pattern = p.openshift_project_pattern
  WHERE
  - e.openshift = NULL;
  + e.openshift IS NULL;
  END;
  $$
  