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'] = 'Mailbox quota';
$wb['quota_txt'] = 'Quota';
$wb['name_txt'] = 'Name';
$wb['email_txt'] = 'Email Address';
$wb['used_txt'] = 'Used space';
$wb['percentage_txt'] = 'Used %';
?>