{% capture categories %}
{% if post %}
{% for category in post.categories %}
{{ category | join: "/" }}{% unless forloop.last %} {% endunless %}
{% endfor %}
{% else %}
{% for category in page.categories %}
{{ category | join: "/" }}{% unless forloop.last %} {% endunless %}
{% endfor %}
{% endif %}
{% endcapture %}
{% capture category_size %}{{ categories | strip_newlines | replace: ' ', '' | size }}{% endcapture %}
{% unless category_size == '0' %}
{{ categories }}
{% endunless %}