AlertClientService null pointer exception in SqlTask. (#4983)

dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/worker/WorkerServer.java

@@ -117,7 +117,7 @@ public class WorkerServer implements IStoppable {
         NettyServerConfig serverConfig = new NettyServerConfig();
         serverConfig.setListenPort(workerConfig.getListenPort());
         this.nettyRemotingServer = new NettyRemotingServer(serverConfig);
-        this.nettyRemotingServer.registerProcessor(CommandType.TASK_EXECUTE_REQUEST, new TaskExecuteProcessor());
+        this.nettyRemotingServer.registerProcessor(CommandType.TASK_EXECUTE_REQUEST, new TaskExecuteProcessor(alertClientService));
         this.nettyRemotingServer.registerProcessor(CommandType.TASK_KILL_REQUEST, new TaskKillProcessor());
         this.nettyRemotingServer.registerProcessor(CommandType.DB_TASK_ACK, new DBTaskAckProcessor());
         this.nettyRemotingServer.registerProcessor(CommandType.DB_TASK_RESPONSE, new DBTaskResponseProcessor());