Admin: Remove notice when deleting batch of users or courses with no user/course selected

main/admin/course_list.php

@@ -334,6 +334,7 @@ if (isset($_POST['action'])) {
     switch ($_POST['action']) {
         // Delete selected courses
         case 'delete_courses':
+            if (!empty($_POST['course'])) {
                 $course_codes = $_POST['course'];
                 if (count($course_codes) > 0) {
                     foreach ($course_codes as $course_code) {
@@ -342,6 +343,7 @@ if (isset($_POST['action'])) {
                 }
 
                 Display::addFlash(Display::return_message(get_lang('Deleted')));
+            }
             break;
     }
 }

main/admin/user_list.php

@@ -870,7 +870,7 @@ if (!empty($action)) {
                 exit;
                 break;
             case 'delete':
-                if (api_is_platform_admin()) {
+                if (api_is_platform_admin() && !empty($_POST['id'])) {
                     $number_of_selected_users = count($_POST['id']);
                     $number_of_affected_users = 0;
                     if (is_array($_POST['id'])) {