Fixed bad url in theme page

onyx/tpl/bootstrap/admin/exercice.tpl

@@ -1,7 +1,15 @@
 {extends file="admin/layout.tpl"}
 {block name=content}
 <p>
-    Theme: {$theme} </br>
-    Exercice: {$ex}
+    Theme: {$theme->name} </br>
+    {if isset($ex)}
+      Exercice: {$ex->id}
+    {else}
+      <ul>
+      {foreach $theme->get_exercices_ordered() as $ex}
+        <li><a href="/{$SALT_ADMIN}/ex/{$theme->id}-{$theme->name}/{$ex->id}">{$ex->get_name()}</a></li>
+      {/foreach}
+      </ul>
+    {/if}
 </p>
 {/block}