Blog/source/_includes/post/categories.html

{% capture category %}{% if post %}{{ post.categories | category_links | size }}{% else %}{{ page.categories | category_links | size }}{% endif %}{% endcapture %}
{% unless category == '0' %}
{% if post %}
{% for category in post.categories %}
  <a href="{{ root_url }}/{{ site.category_dir }}/{{ category | split: " " | join: "-" }}/"><span class="badge">{{ category }}</span></a>
{% endfor %}
{% else %}
{% for category in page.categories %}
  <a href="{{ root_url }}/{{ site.category_dir }}/{{ category | split: " " | join: "-" }}/"><span class="badge">{{ category }}</span></a>
{% endfor %}
{% endif %}
{% endunless %}