fixed problem with Responsible column

smash/web/templates/visits/details.html

@@ -126,7 +126,7 @@
                             <td>{{ app.datetime_when | time:"H:i" }}</td>
                             <td>{{ app.length }}</td>
                             <td>
-                                {% if app.flying_team %}{{ app.worker_assigned.first_name }}
+                                {% if app.flying_team is None %}{{ app.worker_assigned.first_name }}
                                     {{ app.worker_assigned.last_name }}
                                 {% else %} {{ app.flying_team }}
                                 {% endif %}