try to fix

Liquid Exception: Liquid error (line 2): Cannot sort a null object. in
 /github/workspace/_global/Special:***

_global/Special:LongPages.html

@@ -3,6 +3,7 @@ layout: default
 title: Long pages
 menu: ['global']
 ---
+{% if site.data.wiki_pages  %}
 {%- assign long_pages = site.data.wiki_pages | sort: 'bytes' | reverse -%}
 <ol>
 {%- for page in long_pages limit:50 -%}
@@ -11,3 +12,4 @@ menu: ['global']
   </li>
 {%- endfor -%}
 </ol>
+{% endif %}