{% capture feed_footer %}
  <p><a href="{{ site.url }}{{ post.url }}" rel="nofollow">{{ post.title }}</a> was originally published by <a href="{{ site.url }}/about/" rel="nofollow">{{ site.owner.name }}</a> on <a href="{{ site.url }}" rel="nofollow">{{ site.title }}</a></p>
{% endcapture %}
{{ feed_footer | markdownify | xml_escape }}

{% capture feed_footer %}
  <p><a href="{{ site.url }}{{ post.url }}" rel="nofollow">{{ post.title }}</a> was originally published {% if site.author.name %}by <a href="{{ site.author.url | default: site.url }}" rel="nofollow">{{ site.author.name }}</a>{% endif %} on <a href="{{ site.url }}" rel="nofollow">{{ site.title }}</a></p>
{% endcapture %}
{{ feed_footer | markdownify | xml_escape }}

Update author variable name and make conditional
Update author variable name and make conditional
