[FIX] article author

main/templates/main/main_article_page.html

@@ -11,7 +11,9 @@
     <div class="grid-container mb-2 lg:mb-12 relative">
       <div class="grid-left-side h-full bg-grey-150 left-tab">
         <div class="p-6 flex flex-wrap flex-row items-center justify-between xl:items-start xl:flex-col">
+          {% if page.author %}
             <span class="font-bold 3xl:text-xl">AUTOR ČLÁNKU: <br> {{ page.author }}</span><br>
+          {% endif %}
         <div class="flex flex-row static bottom-0 xl:absolute sm:bottom-5">
           {% for social in page.author_page.social_links %}
             <a href="{{ social.value.link }}" class="flex hover:no-underline">