Protects against faults for empty arrays on dashboard

www/pocwww/pocwww/templates/dashboard.jinja2

@@ -21,6 +21,7 @@
                             </tr>
                         </thead>
                         <tbody>
+                            {% if tag_values.length > 0}
                             {% for t in tag_values %}
                                 <tr>
                                     <td><a href="/values/tag/{{t._id}}">{{t._id}}</a></td>
@@ -40,6 +41,7 @@
                                     <td>{{t.total | round(3)}}</td> -->
                                 </tr>
                             {% endfor %}
+                            {% endif %}
                         </tbody>
                     </table>
                 </div>
@@ -47,9 +49,11 @@
             </div>
             <div class="col-xs-6">
                 <h2>Latest Card</h2>
+                {% if latest_card %}
                 <h3>{{latest_card.timestamp | datetime('long')}}</h1>
                 <div class="surfacecard card"></div>
                 <div class="downholecard card"></div>
+                {% endif %}
             </div>
         </div>
     </div>