Issue #3284338 by jwilson3: Hide section nav if content empty

 * Override the system menu block to match IU Framework expectations.

 */

 #}

{% set hasContent = FALSE %}

{% for key, child in element if key|first != '#' %}

  {% set hasContent = TRUE %}

{% endfor %}

{% if hasContent %}

<nav{{ attributes }} role="navigation" aria-label=" {{ 'Section navigation'|t }}" itemscope="itemscope" itemtype="http://schema.org/SiteNavigationElement">

  {{ title_prefix }}{{ title_suffix }}

  <span class="section-nav-label">In this section</span>

  {{ content }}

</nav>

{% endif %}