Add null check & update server version (#1519)

Author: srknzl

scripts/download-rc.js

@@ -1,6 +1,6 @@
 'use strict';
-const HZ_VERSION = '5.2.4';
-const HZ_TEST_VERSION = '5.2.4';
+const HZ_VERSION = '5.4.0-SNAPSHOT';
+const HZ_TEST_VERSION = '5.4.0-SNAPSHOT';
 const HAZELCAST_TEST_VERSION = HZ_TEST_VERSION;
 const HAZELCAST_VERSION = HZ_VERSION;
 const HAZELCAST_ENTERPRISE_VERSION = HZ_VERSION;

test/integration/backward_compatible/parallel/map/MapLockTest.js

@@ -50,6 +50,9 @@ describe('MapLockTest', function () {
         while (attempt++ < MAX_ATTEMPTS) {
             for (let i = 0; i < DEFAULT_PARTITION_COUNT; i++) {
                 const uuid = partitionService.getPartitionOwner(i);
+                if (uuid === null || uuid === undefined) {
+                    continue;
+                }
                 if (uuid.toString() === member.uuid) {
                     return;
                 }