some more fixes for config handling

src/etc/inc/interfaces.inc

@@ -5250,7 +5250,7 @@ function interfaces_staticarp_configure($if)
 		}
 	} else {
 		mwexec("/sbin/ifconfig " . escapeshellarg($ifcfg['if']) . " -staticarp " );
-		mwexec("/usr/sbin/arp -d -i " . escapeshellarg($ifcfg['if']) . " -a > /dev/null 2>&1 ");
+		mwexec("/usr/sbin/arp -d -i " . escapeshellarg($ifcfg['if']) . " -a ");
 		if (isset($config['dhcpd'][$if]['staticmap'])) {
 			foreach ($config['dhcpd'][$if]['staticmap'] as $arpent) {
 				if (isset($arpent['arp_table_static_entry'])) {

src/opnsense/mvc/app/library/OPNsense/Core/Config.php

@@ -112,7 +112,9 @@ class Config extends Singleton
                     // single content item
                     if (is_array($forceList) && array_key_exists($xmlNode->getName(), $forceList)) {
                         $result[$xmlNode->getName()] = array();
-                        $result[$xmlNode->getName()][] = $xmlNode->__toString();
+                        if ($xmlNode->__toString() != null && trim($xmlNode->__toString()) !== "" ){
+                            $result[$xmlNode->getName()][] = $xmlNode->__toString();
+                        }
                     } else {
                         $result[$xmlNode->getName()] = $xmlNode->__toString();
                     }