Check filesize is greater than zero before deleteing a file from library

airtime_mvc/application/models/StoredFile.php

@@ -383,6 +383,9 @@ SQL;
         Logging::info("User ".$user->getLogin()." is deleting file: ".$this->_file->getDbTrackTitle()." - file id: ".$file_id);
 
         $filesize = $this->_file->getFileSize();
+        if ($filesize <= 0) {
+            throw new Exception("Cannot delete file with filesize ".$filesize);
+        }
 
         //Delete the physical file from either the local stor directory
         //or from the cloud