Use $parent instead of $folder_id in folders admin template

templates/backOffice/default/folders.html

@@ -182,7 +182,7 @@
     {* -- CONTENT MANAGEMENT ---------------------------------------------------- *}
 
     {* No content outsie a folder *}
-    {if $folder_id > 0}
+    {if $parent > 0}
     <div class="row">
         <div class="col-md-12">
             <div class="general-block-decorator">
@@ -636,4 +636,4 @@
 
 {block name="javascript-last-call"}
     {module_include location='folders-js'}
-{/block}
+{/block}