[Fix][UI Next][V1.0.0-Beta] Fix console bug after deleting a node from the context menu. (#9932)

dolphinscheduler-ui/src/views/projects/workflow/components/dag/use-task-edit.ts

@@ -120,7 +120,7 @@ export function useTaskEdit(options: Options) {
           process.postTaskCode === code || process.preTaskCode === code
       )
     })
-    cells.forEach((cell) => {
+    cells?.forEach((cell) => {
       if (cell.isEdge()) {
         const preTaskCode = cell.getSourceCellId()
         const postTaskCode = cell.getTargetCellId()