Fix a bug: when the first multi-code block didn't have notes, no lines got notes
Fix a bug: when the first multi-code block didn't have notes, no lines got notes

acgd-learn-the-web/acgd-learn-the-web.github.io,acgd-learn-the-web/www,acgd-learn-the-web/www,acgd-learn-the-web/www,acgd-learn-the-web/www,acgd-learn-the-web/www,acgd-learn-the-web/acgd-learn-the-web.github.io