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'] = 'Directive Snippets';
$wb['active_txt'] = 'Active';
$wb['name_txt'] = 'Name of Snippet';
$wb['type_txt'] = 'Type';
$wb['add_new_record_txt'] = 'Add Directive Snippet';
?>