Fixed PHP warning when no IDN filters are set for field in lists.

Till Brehm

2015-11-14 cc636e1a8ed430f060766e22cbdfeaa8de4afbc3

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# Format: usertype:url_path:field
# usertype can be: any/client/admin
# Example:
# admin:/admin/language_edit.php:POST.records.weak_password_txt
admin:/admin/language_edit.php:POST.records