🐛 fix(feed): conditionally render updated field

themes/tabi/templates/atom.xml

@@ -66,7 +66,9 @@
         {%- endif -%}
     " rel="alternate" type="text/html"/>
     <generator uri="https://www.getzola.org/">Zola</generator>
+        {%- if last_updated -%}
         <updated>{{ last_updated | date(format="%+") }}</updated>
+        {%- endif -%}
     <id>{{ feed_url | safe }}</id>
     {%- for page in pages %}
     {%- if macros_settings::evaluate_setting_priority(setting="hide_from_feed", page=page, default_global_value=false) == "true" -%}