district: Author page link

district/models.py

@@ -211,7 +211,7 @@ class DistrictArticlePage(ArticleMixin, SubpageMixin, MetadataPageMixin, Page):
     ### FIELDS
 
     author_page = models.ForeignKey(
-        "district.DistrictPersonPage", on_delete=models.SET_NULL, null=True
+        "district.DistrictPersonPage", on_delete=models.SET_NULL, null=True, blank=True
     )
     is_black = models.BooleanField("Má tmavé pozadí?", default=False)
     tags = ClusterTaggableManager(through=DistrictArticleTag, blank=True)

district/templates/district/district_article_page.html

@@ -16,7 +16,11 @@
         <div class="inline-flex divide-x flex-grow">
           <span class="pr-2">{{ page.date|date:"SHORT_DATE_FORMAT" }}</span>
           <span class="pl-2" itemprop="author" itemtype="http://schema.org/Person" itemscope="">
+            {% if page.author_page %}
+              <a href="{{ page.author_page.url }}" itemprop="name">{{ page.author }}</a>
+            {% else %}
               <span itemprop="name">{{ page.author }}</span>
+            {% endif %}
           </span>
         </div>
         <div class="my-4">