Merge branch '1.3.2-release' of https://github.com/apache/incubator-dolphinscheduler into 1.3.2-release

dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/upgrade/UpgradeDao.java

@@ -297,13 +297,16 @@ public abstract class UpgradeDao extends AbstractBaseDao {
                 for (int i = 0 ;i < tasks.size() ; i++){
                     JSONObject task = tasks.getJSONObject(i);
                     Integer workerGroupId = task.getInteger("workerGroupId");
-                    if (workerGroupId == null || workerGroupId == -1) {
+                    if (workerGroupId != null) {
+                        if (workerGroupId == -1) {
                             task.put("workerGroup", "default");
                         } else {
                             task.put("workerGroup", oldWorkerGroupMap.get(workerGroupId));
                         }
                     }
 
+                }
+
                 jsonObject.remove(jsonObject.getString("tasks"));
 
                 jsonObject.put("tasks",tasks);