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"] = 'Email templates'; 
$wb["template_type_txt"] = 'Message for'; 
$wb["template_name_txt"] = 'Template name'; 
?>