Fix bug that UpdateTabletMetaInfoTask not returned (#2119)

fe/src/main/java/org/apache/doris/master/ReportHandler.java

@@ -882,7 +882,6 @@ public class ReportHandler extends Daemon {
     
 
     private static void handleSetTabletMetaInfo(long backendId, SetMultimap<Long, Integer> tabletWithoutPartitionId) {
-        
         LOG.info("find [{}] tablets without partition id, try to set them", tabletWithoutPartitionId.size());
         if (tabletWithoutPartitionId.size() < 1) {
             return;

fe/src/main/java/org/apache/doris/task/AgentBatchTask.java

@@ -359,6 +359,7 @@ public class AgentBatchTask implements Runnable {
                     LOG.debug(request.toString());
                 }
                 tAgentTaskRequest.setUpdate_tablet_meta_info_req(request);
+                return tAgentTaskRequest;
             }
             case ALTER: {
                 AlterReplicaTask createRollupTask = (AlterReplicaTask) task;