When authenticaiton succees, a NullPointerException may be triggered if there is…

… no match in portToVlanMap , which will stop aaa from listening to radius server. A try-catch is added here in order to prevent subsequent authentication failure in aaa

Change-Id: Iea0c53ff59ed42f0c369400c155b7d8e14a6748f

@@ -340,7 +340,13 @@ public class OnosXosIntegrationManager implements VoltTenantService {
         }
         }
 
 
         PortNumber onuPort = newTenant.port().port();
         PortNumber onuPort = newTenant.port().port();
-        VlanId subscriberVlan = VlanId.vlanId(portToVlan.get(onuPort.toLong()));
+        VlanId subscriberVlan;
+        try {
+            subscriberVlan = VlanId.vlanId(portToVlan.get(onuPort.toLong()));
+        } catch (NullPointerException npe) {
+            log.error("No matched port in portToVlan map", npe);
+            return newTenant;
+        }
 
 
         VoltTenant tenantToCreate = VoltTenant.builder()
         VoltTenant tenantToCreate = VoltTenant.builder()
                 .withProviderService(providerServiceId)
                 .withProviderService(providerServiceId)