.themes/classic/source/_includes/post/categories.html
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 {% capture category %}{% if post %}{{ post.categories | category_links | size }}{% else %}{{ page.categories | category_links | size }}{% endif %}{% endcapture %}
 {% unless category == '0' %}
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 <span class="categories">
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   {% if post %}
     {{ post.categories | category_links }}
   {% else %}
     {{ page.categories | category_links }}
   {% endif %}
 </span>
 {% endunless %}