And when a parameter is null, it won't appear in the url like `?tag=`.
<!-- Export -->
<aside id="download-form">
- {% set currentTag = '' %}
+ {% set currentTag = null %}
{% if tag is defined %}
{% set currentTag = tag %}
{% endif %}
<!-- Export -->
<div id="export" class="side-nav right-aligned">
- {% set currentTag = '' %}
+ {% set currentTag = null %}
{% if tag is defined %}
{% set currentTag = tag.slug %}
{% endif %}