Merge pull request #189 from zhuanghaozhe/develop

空指针的优化 (#188)

hippo4j-core/src/main/java/cn/hippo4j/core/executor/ThreadPoolNotifyAlarmHandler.java

@@ -167,7 +167,7 @@ public class ThreadPoolNotifyAlarmHandler implements Runnable, CommandLineRunner
      */
     public void asyncSendExecuteTimeOutAlarm(String threadPoolId, long executeTime, long executeTimeOut, ThreadPoolExecutor threadPoolExecutor) {
         ThreadPoolNotifyAlarm threadPoolNotifyAlarm = GlobalNotifyAlarmManage.get(threadPoolId);
-        if (!threadPoolNotifyAlarm.getIsAlarm()) {
+        if (Objects.isNull(threadPoolNotifyAlarm) || !threadPoolNotifyAlarm.getIsAlarm()) {
             return;
         }