Course request: Set description as mandatory field in course request form

Author: @nosolored

main/create_course/add_course.php

@@ -85,6 +85,17 @@ $form->addElement(
 $form->applyFilter('title', 'html_filter');
 $form->addRule('title', get_lang('ThisFieldIsRequired'), 'required');
 
+if ($course_validation_feature) {
+    // Description of the requested course.
+    $form->addElement(
+        'textarea',
+        'description',
+        get_lang('Description'),
+        ['rows' => '3']
+    );
+    $form->addRule('description', get_lang('ThisFieldIsRequired'), 'required');
+}
+
 if (!api_get_configuration_value('course_creation_form_set_course_category_mandatory')) {
     $form->addButtonAdvancedSettings('advanced_params');
     $form->addElement(
@@ -171,14 +182,6 @@ if (!api_get_configuration_value('course_creation_form_hide_course_code')) {
 // The teacher
 $titular = &$form->addElement('hidden', 'tutor_name', '');
 if ($course_validation_feature) {
-    // Description of the requested course.
-    $form->addElement(
-        'textarea',
-        'description',
-        get_lang('Description'),
-        ['rows' => '3']
-    );
-
     // Objectives of the requested course.
     $form->addElement(
         'textarea',