{% 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 %}