fix

mec-biz/src/main/java/com/ym/mec/biz/service/impl/StudentCourseHomeworkServiceImpl.java

@@ -1224,6 +1224,7 @@ public class StudentCourseHomeworkServiceImpl extends BaseServiceImpl<Long, Stud
             for (StudentLessonTrainingDetail trainingDetail : trainingDetails) {
                 StudentLessonTrainingDetail studentLessonTrainingDetail = new StudentLessonTrainingDetail();
                 studentLessonTrainingDetail.setId(trainingDetail.getId());
+                studentLessonTrainingDetail.setHomeworkType(null);
                 String fileJson = trainingDetail.getFileJson();
                 List<CourseHomeworkWrapper.FileJson> fileJsonList = JSON.parseArray(fileJson, CourseHomeworkWrapper.FileJson.class);
                 List<String> delFiles = fileJsonList.stream().map(CourseHomeworkWrapper.FileJson::getFilePath)