example: do not show navbar search field if not connected

example/templates/empty.tpl

@@ -1,5 +1,6 @@
 {extends file='TplCore:empty.tpl'}
 {block name="navbar-extra-content"}
+{if isset($auth_user) && $auth_user}
 <form class="d-flex" role="search" action='item'>
   <div class="input-group input-group-sm me-2">
     <input class="form-control" type="search" name="pattern"
@@ -7,4 +8,5 @@
     <span class="input-group-text"><i class="fa fa-search" aria-hidden="true"></i></span>
   </div>
 </form>
+{/if}
 {/block}