Fixing disk_quota if is NULL in the DB see BT#4855

main/admin/course_edit.php

@@ -186,11 +186,12 @@ foreach ($list_course_extra_field as $extra_field) {
 $form->addElement('style_submit_button', 'button', get_lang('ModifyCourseInfo'),'onclick="valide()"; class="save"');
 
 // Set some default values
-$course_db_name = $course['db_name'];
-$course['disk_quota'] = round($course['disk_quota']/1024/1024, 1);
+//$course['disk_quota'] = round($course['disk_quota']/1024/1024, 1);
+$course['disk_quota'] = round(DocumentManager::get_course_quota($course_code) /1024/1024, 1);
 $course['title'] = api_html_entity_decode($course['title'], ENT_QUOTES, $charset);
 
 $form->setDefaults($course);
+
 // Validate form
 if ($form->validate()) {
 	$course = $form->getSubmitValues();

main/inc/lib/document.lib.php

@@ -20,8 +20,12 @@ class DocumentManager {
     /**
      * @return the document folder quota for the current course, in bytes, or the default quota     
      */
-    public static function get_course_quota() {
-        $course_info = api_get_course_info();
+    public static function get_course_quota($course_code = null) {
+        if (empty($course_code)) {
+            $course_info = api_get_course_info();
+        } else {
+            $course_info = api_get_course_info($course_code);
+        }
         
         $course_quota   = null;
         if (empty($course_info)) {