if subtitle is None, it will be replacedwith a no-break space.

fet2020/templates/home.html

@@ -18,7 +18,7 @@
                     
                     <div class="article-title">
                         <h1>{{ post.title|safe }}</h1>
-                        <p>{{post.subtitle | safe}}</p>
+                        <p>{{ post.subtitle|default_if_none:"&nbsp;"|safe }}</p>
                     </div>
             </div>
         </div>
@@ -27,7 +27,6 @@
     </div>
 
     <div class="medium-4 responsive-side-box cell">
-
         <a href="{% url 'posts.index' %}"><h1>Neuigkeiten</h1></a>
         <div class="article-row-section">
             {% with post=featured_post %}
@@ -37,7 +36,6 @@
                 {% include 'posts/partials/_meeting_row.html' %}
             {% endfor %}
         </div>
-
     </div>
 </div>
 
@@ -46,7 +44,6 @@
         {{ tags_list|tags_to_url }} 
     </div>
 
-
     <div class="grid-x grid-x-padding">
         <div class="medium-8 small-12 small-order-2 medium-order-1"">
             {% for post in posts %}

fet2020/templates/posts/partials/_posts_hero.html

@@ -2,7 +2,8 @@
     <div class="news-hero padding-bottom-1" style="background-image:url('{{ post.imageurl }}')">
         <div class="news-hero-text">
             <h1>{{ post.title }}</h1>
-            <h2>{{post.subtitle}}</h2>{{post}}
+            <h2>{{ post.subtitle|default_if_none:"&nbsp;" }}</h2>
+            {{ post }}
         </div>
     </div>
 </a>

fet2020/templates/posts/show.html

@@ -1,4 +1,3 @@
-
 {% extends "layout.html" %}
 {% load post_helpers %}
 {% load admin_urls %}
@@ -16,7 +15,7 @@
             </div>
 
             <div class="article-details">
-            {{post.subtitle |tags_to_url}}
+                {{ post.subtitle|default_if_none:"&nbsp;"|tags_to_url }}
 
                 {% if post.author %}
                     <div class="article-author"><a href="{% url 'member' post.author %}">
@@ -29,11 +28,7 @@
                     {{ post.author }}</a>
                     </div>
                 {% endif %}
-
-            </div> <button class="">
-
-            <span class="nav fa fa-chevron-right fa-3x"></span>
-        </button>
+            </div>
         </div>
     </div>
 </div>
@@ -42,11 +37,11 @@
     <div class="grid-x">
         <div class="cell medium-8">
             <h1>{{ post.title|tags_to_url }}</h1>
-            <strong>{{post.subtitle | tags_to_url}}</strong><span class="nav fa fa-chevron-right fa-3x"></span>
+            <strong>{{ post.subtitle|default_if_none:"&nbsp;"|tags_to_url }}</strong>
+            <span class="nav fa fa-chevron-right fa-3x"></span>
             <br>
             <a href="{% url 'posts.show' next %}">Nächster Artikel</a><br>
 
-        
             <div class="cell medium-4">
             {% include 'posts/partials/_date_box.html' %}
             </div>
@@ -81,8 +76,8 @@
             {{ post.body|safe|add_internal_links|tags_to_url }}
             <hr>
         </div>
-
     </div>
+
     <div class="grid-x grid-margin-x">
         {% for post in related_posts %}
         <div class="medium-6 large-4 small-12 cell">