Fix function name, add comments see BT#2957

main/webservices/user_import/import.lib.php

@@ -1,4 +1,6 @@
 <?php
+/* For licensing terms, see /license.txt*/
+
 /**
  * Validates imported data.
  */
@@ -87,6 +89,8 @@ function complete_missing_data($user)
 
 /**
  * Save the imported data.
+ *
+ * @param array
  */
 function save_data($users)
 {
@@ -107,15 +111,18 @@ function save_data($users)
                 '',
                 $user['AuthSource']
             );
-            foreach ($user['Courses'] as $index => $course) {
+
+            if (!empty($user['Courses'])) {
+                foreach ($user['Courses'] as $course) {
                     if (CourseManager::course_exists($course)) {
-                    CourseManager:: subscribe_user(
+                        CourseManager::subscribeUser(
                             $user_id,
                             $course,
                             $user['Status']
                         );
                     }
                 }
+            }
 
             // TODO: Hard-coded French texts.