YARN-8357. Fixed NPE when YARN service is saved and not deployed.

            Contributed by Chandni Singh

(cherry picked from commit d9852eb5897a25323ab0302c2c0decb61d310e5e)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/main/java/org/apache/hadoop/yarn/service/client/ServiceClient.java

@@ -1198,6 +1198,7 @@ public class ServiceClient extends AppAdminClient implements SliderExitCodes,
     ServiceApiUtil.validateNameFormat(serviceName, getConfig());
     Service appSpec = new Service();
     appSpec.setName(serviceName);
+    appSpec.setState(ServiceState.STOPPED);
     ApplicationId currentAppId = getAppId(serviceName);
     if (currentAppId == null) {
       LOG.info("Service {} does not have an application ID", serviceName);