[Fix-16567] Unable to delete copied nodes in unsaved workflow (#16576)

1. Fix the handling logic for when the backend API returns an empty array
2. If the dependent Lineage Task List is empty, no further query is required

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/WorkflowLineageServiceImpl.java

@@ -260,16 +260,19 @@ public class WorkflowLineageServiceImpl extends BaseServiceImpl implements Workf
         if (project == null) {
             throw new ServiceException(Status.PROJECT_NOT_FOUND, projectCode);
         }
+        List<DependentLineageTask> dependentLineageTaskList = new ArrayList<>();
         List<WorkflowTaskLineage> workflowTaskLineageList =
                 workflowTaskLineageDao.queryWorkFlowLineageByDept(projectCode,
                         workflowDefinitionCode, taskCode == null ? 0 : taskCode);
+        if (workflowTaskLineageList.isEmpty()) {
+            return dependentLineageTaskList;
+        }
         List<WorkflowDefinition> workflowDefinitionList =
                 workflowDefinitionMapper.queryByCodes(workflowTaskLineageList.stream()
                         .map(WorkflowTaskLineage::getWorkflowDefinitionCode).distinct().collect(Collectors.toList()));
         List<TaskDefinition> taskDefinitionList = taskDefinitionMapper.queryByCodeList(workflowTaskLineageList.stream()
                 .map(WorkflowTaskLineage::getTaskDefinitionCode).filter(code -> code != 0).distinct()
                 .collect(Collectors.toList()));
-        List<DependentLineageTask> dependentLineageTaskList = new ArrayList<>();
         for (WorkflowTaskLineage workflowTaskLineage : workflowTaskLineageList) {
             DependentLineageTask dependentLineageTask = new DependentLineageTask();
             taskDefinitionList.stream()

dolphinscheduler-ui/src/views/projects/components/dependencies/use-dependencies.ts

@@ -30,15 +30,22 @@ export function useDependencies() {
         workFlowCode: workflowCode,
         taskCode: taskCode
       } as DependentTaskReq
-      const res = await queryDependentTasks(projectCode, dependentTaskReq)
-      res
-        .filter((item: any) => item.workflowDefinitionCode !== workflowCode)
+      await queryDependentTasks(projectCode, dependentTaskReq).then(
+        (res: any) => {
+          if (res?.data?.length > 0) {
+            res.data
+              .filter(
+                (item: any) => item.workflowDefinitionCode !== workflowCode
+              )
               .forEach((item: any) => {
                 tasks.push(
                   item.workflowDefinitionName + '->' + item.taskDefinitionName
                 )
               })
           }
+        }
+      )
+    }
     return tasks
   }
 
@@ -51,15 +58,22 @@ export function useDependencies() {
       const dependentTaskReq = {
         workFlowCode: workflowCode
       } as DependentTaskReq
-      const res = await queryDependentTasks(projectCode, dependentTaskReq)
-      res
-        .filter((item: any) => item.workflowDefinitionCode !== workflowCode)
+      await queryDependentTasks(projectCode, dependentTaskReq).then(
+        (res: any) => {
+          if (res?.data?.length > 0) {
+            res.data
+              .filter(
+                (item: any) => item.workflowDefinitionCode !== workflowCode
+              )
               .forEach((item: any) => {
                 tasks.push(
                   item.workflowDefinitionName + '->' + item.taskDefinitionName
                 )
               })
           }
+        }
+      )
+    }
     return tasks
   }
 
@@ -110,6 +124,7 @@ export function useDependencies() {
     if (workflowCode && projectCode) {
       await queryDependentTasks(projectCode, dependentTaskReq).then(
         (res: any) => {
+          if (res?.data?.length > 0) {
             res.data
               .filter((item: any) => {
                 if (item.workflowDefinitionCode) {
@@ -121,7 +136,9 @@ export function useDependencies() {
               .forEach((item: any) => {
                 dependentTaskLinks.push({
                   text:
-                  item.workflowDefinitionName + '->' + item.taskDefinitionName,
+                    item.workflowDefinitionName +
+                    '->' +
+                    item.taskDefinitionName,
                   show: true,
                   action: () => {
                     const url = `/projects/${item.projectCode}/workflow/definitions/${item.workflowDefinitionCode}`
@@ -130,6 +147,7 @@ export function useDependencies() {
                 })
               })
           }
+        }
       )
     }
     return dependentTaskLinks
@@ -148,12 +166,17 @@ export function useDependencies() {
     if (workflowCode && projectCode) {
       await queryDependentTasks(projectCode, dependentTaskReq).then(
         (res: any) => {
-          res
-            .filter((item: any) => item.workflowDefinitionCode !== workflowCode)
+          if (res?.data?.length > 0) {
+            res.data
+              .filter(
+                (item: any) => item.workflowDefinitionCode !== workflowCode
+              )
               .forEach((item: any) => {
                 dependentTaskLinks.push({
                   text:
-                  item.workflowDefinitionName + '->' + item.taskDefinitionName,
+                    item.workflowDefinitionName +
+                    '->' +
+                    item.taskDefinitionName,
                   show: true,
                   action: () => {
                     const url = `/projects/${item.projectCode}/workflow/definitions/${item.workflowDefinitionCode}`
@@ -162,6 +185,7 @@ export function useDependencies() {
                 })
               })
           }
+        }
       )
     }
     return dependentTaskLinks