How to hide the Category Tree module with only one category

The idea here is simple. Prestashop displays "Category Tree" module all the time. Even if we are browsing the last sub-sub-sub...category and there's only 1 item to display.

This is what I mean:

So the quest now is to change it to this:

In other words: to hide the Category Tree module if there's only 1 item.

How to hide the module?

Open this file:
/your_theme/modules/ps_categorytree/views/templates/hook/ps_categorytree.tpl

Find this piece of code:

<div class="block-categories hidden-sm-down">
  <ul class="category-top-menu">
    <li><a class="text-uppercase h6" href="{$categories.link nofilter}">{$categories.name}</a></li>
    <li>{categories nodes=$categories.children}</li>
  </ul>
</div>

And change it to this:

{if isset($nodes) && ($nodes|count > 1)}
<div class="block-categories hidden-sm-down">
  <ul class="category-top-menu">
    <li><a class="text-uppercase h6" href="{$categories.link nofilter}">{$categories.name}</a></li>
    <li>{categories nodes=$categories.children}</li>
  </ul>
</div>
{/if}

And that is it! :)