cc-3936: Added warning whenever files that don't exist in db are requested to be deleted.

airtime_mvc/application/controllers/ApiController.php

@@ -517,6 +517,8 @@ class ApiController extends Zend_Controller_Action
 
             if (is_null($file)) {
                 $return_hash['error'] =  "File doesn't exist in Airtime.";
+                Logging::warn("Attempt to delete file that doesn't exist.
+                    Path: '$filepath'");
                 return $return_hash;
             }
             else {