(legacy) fix some warnings/notices in guiconfig.inc

src/www/guiconfig.inc

@@ -161,7 +161,10 @@ function do_input_validation($postdata, $reqdfields, $reqdfieldsn, &$input_error
 	}
 
 	for ($i = 0; $i < count($reqdfields); $i++) {
-		if ($_POST[$reqdfields[$i]] == "" && $_REQUEST[$reqdfields[$i]] == "") {
+		// why.. do you want to do this? we send data to validate and then validate something else....
+		// can't now for sure if any page uses this wrong behaviour, but it should die eventually.
+		// TODO: kill 
+		if (empty($_POST[$reqdfields[$i]]) && empty($_REQUEST[$reqdfields[$i]])) {
 			$input_errors[] = sprintf(gettext("The field %s is required."), $reqdfieldsn[$i]);
 		}
 	}
@@ -477,10 +480,13 @@ function address_to_pconfig($adr, &$padr, &$pmask, &$pnot, &$pbeginport, &$pendp
 	else
 		$pnot = 0;
 
-	if ($adr['port']) {
+	if (isset($adr['port'])) {
+		if (strpos('-', $adr['port']) !== false) {
 			list($pbeginport, $pendport) = explode("-", $adr['port']);
-		if (!$pendport)
+		} else {
+			$pbeginport = $adr['port'];
 			$pendport = $pbeginport;
+		}
 	} else if (!is_alias($pbeginport) && !is_alias($pendport)) {
 		$pbeginport = "any";
 		$pendport = "any";