fix: 停止实验失败

src/main/java/com/qyft/gd/controller/TasksController.java

@@ -69,6 +69,9 @@ public class TasksController {
     @Operation(summary = "停止实验")
     @PostMapping("/stop")
     public Result<Integer> stopTask(@RequestBody StopTaskDTO dto) {
-        return Result.success(tasksService.stopTask(dto.getTaskId()));
+        if(dto.getTaskId() != null) {
+            return Result.success(tasksService.stopTask(dto.getTaskId()));
+        }
+        return Result.failed("停止实验失败");
     }
 }