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['description_txt'] = 'Description';
$wb['name_txt'] = 'Group';
$wb['name_err'] = 'Group must be min 1, max 30 Chars.';
?>