Fix error on front not loggued

templates/common/modale_choix_groupe.html.twig

@@ -10,11 +10,13 @@
       </div>
       <div class="modal-body">
         <div class='row'>
+          {% if app.user %}
             {% for group in app.user.groups %}
               <div class='col'>
                 <a role="button" class="btn btn-secondary text-nowrap" href='{{path('group_choice', {'id': group.id})}}'>{{ group.name|trans }}</a>
               </div>
             {% endfor %}
+          {% endif %}
         </div>
       </div>
       {# <div class="modal-footer">