fixes #3674

Closes #3674

Merge request studip/studip!2547

lib/classes/TreeAbstract.class.php

@@ -358,7 +358,7 @@ class TreeAbstract {
     */
     public function getParents($item_id)
     {
-        if (!$this->tree_data[$item_id]) {
+        if (empty($this->tree_data[$item_id])) {
             return [];
         }
 

templates/dates/seminar_html.php

 <?php
 if (!$dates['regular']['turnus_data'] && empty($dates['irregular'])) {
-    if ($dates['ort'] && $show_room) {
+    if ($dates['ort'] && !empty($show_room)) {
         echo htmlReady($dates['ort']);
     } else {
         echo _('Die Zeiten der Veranstaltung stehen nicht fest.');

templates/dates/seminar_html_location.php

@@ -80,7 +80,7 @@ endforeach;
 
 
 <? if (count($output) === 0) : ?>
-    <?= htmlReady($ort) ?: _('Keine Raumangabe') ?>
+    <?= empty($ort) ? _('Keine Raumangabe') : htmlReady($ort) ?>
 <? else: ?>
     <dl>
         <? foreach ($output as $room_html => $dates) : ?>
@@ -91,5 +91,5 @@ endforeach;
                 </dd>
             <? endforeach ?>
         <? endforeach ?>
-    </table>
+    </dl>
 <? endif ?>