prevent empty support messages in help module (Fixes: #3697)

Florian Schaal

2016-05-26 52a8e7e2f53b23f41b40aa5bc5b35f338aaec3dd

 interface/web/dns/form/dns_spf.tform.php

@@ -127,7 +127,7 @@
               'range' => '60:',
               'errmsg'=> 'ttl_range_error'),
         ),
         'default' => '86400',
         'default' => '3600',
         'value'  => '',
         'width'  => '10',
         'maxlength' => '10'