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'] = 'Web traffic';
$wb['domain_txt'] = 'Domain';
$wb['this_month_txt'] = 'This month';
$wb['last_month_txt'] = 'Last month';
$wb['this_year_txt'] = 'This year';
$wb['last_year_txt'] = 'Last year';
$wb['sum_txt'] = 'Sum';
?>