remove antiflood call on empty password

kamailio/registrar-role.cfg

@@ -93,10 +93,6 @@ route[ATTEMPT_AUTHORIZATION]
     }
 
     if($var(password) == $null || $var(password) == "") {
-        #!ifdef ANTIFLOOD-ROLE
-        route(ANITFLOOD_FAILED_AUTH);
-        #!endif
-        
         auth_challenge("$fd", "0");
         xlog("L_INFO", "$ci|end|issued auth challenge to registration attempt for $Au $si:$sp due to empty password");
         exit;