{% capture category %}{% if post %}{{ post.categories | category_links | size }}{% else %}{{ page.categories | category_links | size }}{% endif %}{% endcapture %}

{% unless category == '0' %}

<span class="categories">

  {% if post %}

    {{ post.categories | category_links }}

  {% else %}

    {{ page.categories | category_links }}

  {% endif %}

</span>

{% endunless %}