Added allowempty setting to ISEMAIL validator.

Till Brehm

2016-01-29 a8ab61eeb0beac52d5a1e8c41d549df4ed87bf71

 interface/web/admin/form/firewall.tform.php

@@ -79,7 +79,7 @@
               'regex' => '/^[\s0-9\,\:]{0,255}$/',
               'errmsg'=> 'tcp_ports_error_regex'),
         ),
         'default' => '20,21,22,25,53,80,110,143,443,993,995,3306,8080,8081,10000',
         'default' => '20,21,22,25,53,80,110,143,443,587,993,995,3306,8080,8081,10000',
         'value'  => '',
         'width'  => '30',
         'maxlength' => '255'