Mark empty day links "nofollow" (TEC 3.0) in month view

<?php
/**
 * Override for the month view single day template.
 *
 * This file should live at [your-theme]/tribe-events/month/single-day.php - it is one part of a workaround to avoid
 * empty day views from being indexed by search engines (as those pages return a 404 status).
 */

if ( !defined('ABSPATH') ) { die('-1'); } ?>

<?php $day = tribe_events_get_current_month_day() ?>

<?php if ($day['date'] != 'previous' && $day['date'] != 'next') : ?>

    <?php $has_events = false ?>
    <?php ob_start() ?>

    <!-- Events List -->
    <?php while ($day['events']->have_posts()) : $day['events']->the_post() ?>
        <?php tribe_get_template_part('month/single', 'event') ?>
        <?php $has_events = true ?>
    <?php endwhile; ?>

    <!-- View More -->
    <?php if ($day['view_more']) : ?>
        <div class="tribe-events-viewmore">
            <a href="<?php echo $day['view_more'] ?>">View All <?php echo $day['total_events'] ?> &raquo;</a>
        </div>
    <?php endif ?>

    <?php $day_items = ob_get_clean() ?>

    <!-- Day Header -->
    <div id="tribe-events-daynum-<?php echo $day['daynum'] ?>">

        <a href="<?php echo tribe_get_day_link($day['date']) ?>" <?php if (!$has_events) echo 'rel="nofollow"' ?>><?php echo $day['daynum'] ?></a>

    </div>

    <?php echo $day_items ?>

<?php endif; ?>