avoid creating empty tbody elements, fixes #1730

Closes #1730

Merge request studip/studip!1127

app/views/file/choose_file.php

@@ -85,6 +85,7 @@ if (Request::get('to_folder_id')) {
         </tr>
     </tbody>
 <? else : ?>
+    <? if (count($top_folder->getSubfolders()) > 0) : ?>
         <tbody>
         <? foreach ($top_folder->getSubfolders() as $subfolder) : ?>
             <? if (!$subfolder->isVisible($GLOBALS['user']->id)) continue; ?>
@@ -117,7 +118,8 @@ if (Request::get('to_folder_id')) {
             </tr>
         <? endforeach; ?>
         </tbody>
-    <? if (count($top_folder->getFiles())) : ?>
+    <? endif ?>
+    <? if (count($top_folder->getFiles()) > 0) : ?>
         <tbody>
         <? foreach ($top_folder->getFiles() as $file) : ?>
             <tr>