try to include footer content only when footerContent key is set

app/controller/page.php

@@ -22,17 +22,22 @@ class Page {
                 'templateContent'=>'maincontent.html'
             ));
             self::folder2();
-            $footer = new \Modules\FilesInFolders(
-                $f3->get('CONTENT')."footer/",
-                array('content'=>array(
-                    'secondary'=>'secondary',
-                    'zzz'=>'hidden',
-                    'unpublish'=>'hidden'
-                ))
-            );
-            $footer->prepare_files();
-            $footer->fill_content();
-            $f3->set('footer_content', implode("\n", $footer->content['default']));
+            $footer_content = $f3->get('footerContent') ? : false;
+            if ($footer_content) {
+                $footer = new \Modules\FilesInFolders(
+                    $f3->get('CONTENT')."footer/",
+                    array('content'=>array(
+                        'secondary'=>'secondary',
+                        'zzz'=>'hidden',
+                        'unpublish'=>'hidden'
+                    ))
+                );
+                $footer->prepare_files();
+                $footer->fill_content();
+                $f3->set('footer_content', implode("\n", $footer->content['default']));
+            } else {
+                $f3->set('footer_content', "");
+            }
             break;
         }
     }