CC-3975: Media Library: Try to download files from watched folder, the filename will be "true"

-fixed (originally scheduled for 2.2 - adding for 2.1.3)

airtime_mvc/application/controllers/ApiController.php

@@ -129,6 +129,9 @@ class ApiController extends Zend_Controller_Action
                 if(is_file($filepath)){
                     $full_path = $media->getPropelOrm()->getDbFilepath();
                     $file_base_name = strrchr($full_path, '/');
+                    if (!$file_base_name) {
+                        $file_base_name = $full_path;
+                    } 
                     $file_base_name = substr($file_base_name, 1);
                     // possibly use fileinfo module here in the future.
                     // http://www.php.net/manual/en/book.fileinfo.php