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

Till Brehm

2015-11-14 cc636e1a8ed430f060766e22cbdfeaa8de4afbc3

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<?php
$db_user = '{mysql_server_ispconfig_user}';
$db_pass = '{mysql_server_ispconfig_password}';
$db_name = '{mysql_server_database}';
$db_host = '{mysql_server_ip}';
$isp_server_id = '{server_id}';