fixing null pointer exception during client creation

mifosng-provider/src/main/java/org/mifosplatform/portfolio/client/service/ClientWritePlatformServiceJpaRepositoryImpl.java

@@ -581,6 +581,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
     private void validateParentGroupRulesBeforeClientActivation(Client client) {
         Integer minNumberOfClients = configurationDomainService.retrieveMinAllowedClientsInGroup();
         Integer maxNumberOfClients = configurationDomainService.retrieveMaxAllowedClientsInGroup();
+        if (client.getGroups() != null) {
             for (Group group : client.getGroups()) {
                 /**
                  * Since this Client has not yet been associated with the group,
@@ -591,5 +592,5 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
                         maxNumberOfClients); }
             }
         }
-
+    }
 }