CC-4393: Please ignore Flac items for Playlist Preview and disable to preview it as a single track

- fixed

airtime_mvc/application/controllers/AudiopreviewController.php

@@ -184,6 +184,7 @@ class AudiopreviewController extends Zend_Controller_Action
                 'element_artist' => isset($track['artist_name'])?$track['artist_name']:"",
                 'element_id' => isset($track['id'])?$track['id']:"",
                 'element_position' => isset($track['position'])?$track['position']:"",
+                'mime' => isset($track['mime'])?$track['mime']:""
             );
 
         /* If the track type is static we know it must be