src: fix a few warings from recent crash reports

src/etc/inc/filter.inc

@@ -3113,7 +3113,7 @@ EOD;
 	 *  interface in question to avoid problems with complicated routing
 	 *  topologies
 	 */
-	if(isset($config['filter']['bypassstaticroutes']) && is_array($config['staticroutes']['route']) && count($config['staticroutes']['route'])) {
+	if(isset($config['filter']['bypassstaticroutes']) && isset($config['staticroutes']['route']) && count($config['staticroutes']['route'])) {
 		$ipfrules .= "# Add rules to bypass firewall rules for static routes\n";
 		foreach (get_staticroutes() as $route) {
 			$friendly = $GatewaysList[$route['gateway']]['friendlyiface'];

src/etc/inc/interfaces.inc

@@ -1665,7 +1665,7 @@ default:
 EOD;
 	$setdefaultgw = false;
 	$founddefaultgw = false;
-	if (is_array($config['gateways']['gateway_item'])) {
+	if (isset($config['gateways']['gateway_item'])) {
 		foreach($config['gateways']['gateway_item'] as $gateway) {
 			if($interface == $gateway['interface'] && isset($gateway['defaultgw'])) {
 				$setdefaultgw = true;

src/etc/inc/services.inc

@@ -788,7 +788,7 @@ EOD;
 
 		// Handle option, number rowhelper values
 		$dhcpdconf .= "\n";
-		if($dhcpifconf['numberoptions']['item']) {
+		if (isset($dhcpifconf['numberoptions']['item'])) {
 			foreach($dhcpifconf['numberoptions']['item'] as $itemidx => $item) {
 				if(empty($item['type']) || $item['type'] == "text")
 					$dhcpdconf .= "	option custom-{$dhcpif}-{$itemidx} \"{$item['value']}\";\n";

src/www/services_dnsmasq.php

@@ -403,7 +403,7 @@ function show_advanced_dns() {
 												</tr>
 											</table>
 									</tr>
-									<?php if ($hostent['aliases']['item'] && is_array($hostent['aliases']['item'])): ?>
+									<?php if (isset($hostent['aliases']['item'])): ?>
 									<?php foreach ($hostent['aliases']['item'] as $alias): ?>
 									<tr>
 										<td class="listlr" ondblclick="document.location='services_dnsmasq_edit.php?id=<?=$i;?>';">