YARN-9400. Remove unnecessary if at EntityGroupFSTimelineStore#parseApplicationId. Contributed by Prabhu Joseph.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/src/main/java/org/apache/hadoop/yarn/server/timeline/EntityGroupFSTimelineStore.java

@@ -549,15 +549,11 @@ public class EntityGroupFSTimelineStore extends CompositeService
 
   // converts the String to an ApplicationId or null if conversion failed
   private static ApplicationId parseApplicationId(String appIdStr) {
-    ApplicationId appId = null;
-    if (appIdStr.startsWith(ApplicationId.appIdStrPrefix)) {
-      try {
-        appId = ApplicationId.fromString(appIdStr);
-      } catch (IllegalArgumentException e) {
-        appId = null;
-      }
+    try {
+      return ApplicationId.fromString(appIdStr);
+    } catch (IllegalArgumentException e) {
+      return null;
     }
-    return appId;
   }
 
   private static ClassLoader createPluginClassLoader(