Missing conditional place holder for attendees

I am looking for conditional placeholder has_attendees, but surprisingly there seems not to be such a placeholder.

So I tried to make my own condtional placeholder based on the suggestion done here: https://projectdmc.org/support/topic/field-for-organizer. Unfortunate my code isn’t working. No matter the event has attendees or not the outcome is always true. This is my code:

add_filter('em_event_output_show_condition', 'my_em_has_attendees', 1, 4);
/* Whether to display the event format content between {has_attendees}the content{/has_attendees} */
function my_em_has_attendees($show, $condition, $full_match, $EM_Event)
{
    if ('has_attendees' == $condition) {
        $EM_Bookings = $EM_Event->get_bookings();
        $EM_MyCountBookings = 0;
        foreach ($EM_Bookings as $EM_Booking) {
            if ($EM_Booking->booking_status == 1) {
                $EM_MyCountBookings += 1;
            }
        }
        if ($EM_MyCountBookings > 0) {
            $show = true;
        }
    }
    return $show;
}

What did I do wrong?