Hide read button if no epub

frontend/templates/work.html

@@ -179,11 +179,13 @@
             </div>
         </div>
         <div class="bookSidebar">
+            {% if has_online_book %}
             <div class="bookRead">
                 <a href="{% url 'read' work_id %}">
                     <button class="button expanded success">Read</button>
                 </a>
             </div>
+            {% endif %}
             <div class="bookDownload">
                 <a href="{% url 'download' work_id %}">
                     <button class="button expanded success">Download</button>

frontend/views/__init__.py

@@ -422,7 +422,8 @@ def work(request, work_id, action='display'):
         'cover_width': cover_width_number,
         'action': action,
         'formset': formset,
-        'kwform': SubjectSelectForm()
+        'kwform': SubjectSelectForm(),
+        'has_online_book': work.first_epub() != None,
     })
 
 def edition_uploads(request, edition_id):