From e0dac0f4d7f6eb45b23c2eb4f21a584f4cb90b07 Mon Sep 17 00:00:00 2001
From: Guillermo Alvarez <guillermo.alvarez@blackboard.com>
Date: Fri, 24 Aug 2018 12:40:06 -0500
Subject: [PATCH] MDL-63231 filepicker: Skype validation for null values

In file_get_all_files_in_draftarea function an integer could get
a null value so it is necessary to execute this function only
when is called with a valid integer value.
---
 lib/form/filemanager.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/form/filemanager.php b/lib/form/filemanager.php
index 26c2271e0d4..af191a0e8d6 100644
--- a/lib/form/filemanager.php
+++ b/lib/form/filemanager.php
@@ -320,11 +320,15 @@ class MoodleQuickForm_filemanager extends HTML_QuickForm_element implements temp
     /**
      * Check that all files have the allowed type.
      *
-     * @param array $value Draft item id with the uploaded files.
+     * @param int $value Draft item id with the uploaded files.
      * @return string|null Validation error message or null.
      */
     public function validateSubmitValue($value) {
 
+        if (empty($value)) {
+            return;
+        }
+
         $filetypesutil = new \core_form\filetypes_util();
         $whitelist = $filetypesutil->normalize_file_types($this->_options['accepted_types']);