When one post have only one category will hit the bug.
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1 changed files with 5 additions and 3 deletions
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@ -20,9 +20,11 @@ title: Categories
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{% for post in posts_of_category %}
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{% assign second_category = post.categories[1] %}
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{% unless sub_categories contains second_category %}
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{% assign sub_categories = sub_categories | push: second_category %}
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{% endunless %}
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{% if second_category %}
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{% unless sub_categories contains second_category %}
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{% assign sub_categories = sub_categories | push: second_category %}
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{% endunless %}
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{% endif %}
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{% endfor %}
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{% assign sub_categories = sub_categories | sort %}
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