Add message if no associations in a city, fix php redirect script

templates/associations.html

@@ -80,6 +80,8 @@
                 <td><b><a href="{% url 'dronken:association' association.city.slug association.slug %}">{{ association|safe }}</a></b></td>
                 <td><b>{% if association.has_intern %}{{ association.state|upper }}{% else %}{{ association.short_name|safe|upper }} HEEFT GEEN INTERN!{% endif %}</b></td>
             </tr>
+        {% empty %}
+            <tr><td><h4>{{ city.name }} heeft helemaal geen verenigingen!</h4></td></tr>
         {% endfor %}
         </tbody>
     </table>