<li><a href="{{ relative_root_path }}{% link setup.md %}">Setup</a></li>
{% comment %} Show lesson episodes for lessons. {% endcomment %}
- {% if lesson_episodes.length > 0 %}
+ {% if lesson_episodes.size > 0 %}
<li class="dropdown">
<a href="{{ relative_root_path }}/" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Episodes <span class="caret"></span></a>
<ul class="dropdown-menu">