fix: better view when no accounting periods are active

cof_clubs/templates/cof_clubs/club_list.html

@@ -13,14 +13,20 @@
     <table class="table is-bordered is-striped is-fullwidth">
       <thead>
         <tr>
-          <th rowspan="2" >Nom du club</th>
+          <th{% if accounting_periods|length > 0 %} rowspan="2"{% endif %}>Nom du club</th>
+          {% if accounting_periods|length > 0 %}
           <th colspan="{{ accounting_periods.count }}" >Budget restant</th>
+          {% endif %}
         </tr>
+        {% for period in accounting_periods %}
+        {% if forloop.first %}
         <tr>
-          {% for period in accounting_periods %}
+        {% endif %}
           <th>{{ period.name }}</th>
-          {% endfor %}
+        {% if forloop.last %}
         </tr>
+        {% endif %}
+        {% endfor %}
       </thead>
       <tbody>
         {% for club, data in clubs.items %}