In some corner cases we have seen TestRunStatistics from AzureEngine …

…to be null, this fix waits a little longer in such scenarios to avoid NPE

jmeter-java-dsl-azure/src/main/java/us/abstracta/jmeter/javadsl/azure/AzureEngine.java

@@ -532,7 +532,8 @@ private TestRun awaitTestEnd(TestRun testRun)
 
   private TestRun awaitVirtualUsers(TestRun testRun) throws InterruptedException, IOException {
     Instant start = Instant.now();
-    while (testRun.getVirtualUsers() == null && !hasTimedOut(TEST_END_TIMEOUT, start)) {
+    while ((testRun.getVirtualUsers() == null || testRun.getTestRunStatistics() == null)
+        && !hasTimedOut(TEST_END_TIMEOUT, start)) {
       Thread.sleep(STATUS_POLL_PERIOD.toMillis());
       testRun = apiClient.findTestRunById(testRun.getId());
     }