Fix: do not remove empty statements from if-else or loops

    @Override

    public Visitable visit(EmptyStmt n, NodeHashSet<Node> arg) {

        // Do not remove empty bodies from if-else or loops

        Node parent = n.getParentNode().orElse(null);

        if (parent instanceof IfStmt &&

                (((IfStmt) parent).getThenStmt() == n || ((IfStmt) parent).getElseStmt().orElse(null) == n))

            return n;

        if (parent instanceof NodeWithBody && ((NodeWithBody<?>) parent).getBody() == n)

            return n;

        return arg.contains(n) ? n : null;

    }

}