Fixed PHP warning when no IDN filters are set for field in lists.

Till Brehm

2015-11-14 cc636e1a8ed430f060766e22cbdfeaa8de4afbc3

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<?php
$wb['list_head_txt'] = 'ISPConfig Log';
$wb['tstamp_txt'] = 'Date';
$wb['server_id_txt'] = 'Server';
$wb['loglevel_txt'] = 'Loglevel';
$wb['message_txt'] = 'Message';
?>