【实训导出BUG修复】

src/main/java/club/joylink/rtss/services/training2/Training2PublishService.java

@@ -472,7 +472,6 @@ public class Training2PublishService {
         List<PublishedTraining2WithBLOBs> training2WithBLOBsList = publishedDao.selectByExampleWithBLOBs(example);
         Map<Long, List<PublishedTraining2WithBLOBs>> mapTrainingMap = training2WithBLOBsList.stream().peek(t -> {
             t.setId(null);
-            t.setMapId(null);
             t.setUpdateTime(null);
             t.setCreateTime(null);
         }).collect(Collectors.groupingBy(PublishedTraining2WithBLOBs::getMapId));