Fix for #443

cps/templates/detail.html

@@ -15,6 +15,7 @@
       <div class="btn-toolbar" role="toolbar">
         <div class="btn-group" role="group" aria-label="Download, send to Kindle, reading">
           {% if g.user.role_download() %}
+            {% if entry.data|length %}
             <div class="btn-group" role="group">
                 {% if entry.data|length < 3 %}
                   <button type="button" class="btn btn-primary">
@@ -38,10 +39,11 @@
                 {% endif %}
             </div>
             {% endif %}
-
+          {% endif %}
             {% if g.user.kindle_mail and g.user.is_authenticated %}
             <a href="{{url_for('send_to_kindle', book_id=entry.id)}}" id="sendbtn" class="btn btn-primary" role="button"><span class="glyphicon glyphicon-send"></span> {{_('Send to Kindle')}}</a>
             {% endif %}
+              {% if entry.data|length  %}
               <div class="btn-group" role="group">
                 <button id="read-in-browser" type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                   <span class="glyphicon glyphicon-eye-open"></span> {{_('Read in browser')}}
@@ -55,6 +57,7 @@
                     {%endfor%}
                     </ul>
               </div>
+              {% endif %}
         </div>
       </div>
       <h2>{{entry.title}}</h2>