课程分类重复删除问题

release-service/src/main/java/com/mmc/csf/release/service/impl/FlyerTrainingServiceImpl.java

@@ -221,7 +221,10 @@ public class FlyerTrainingServiceImpl implements FlyerTrainingService {
     @Override
     public ResultBody removeCurriculumClassify(Integer id) {
         CurriculumClassifyDO classifyDO = flyerTrainingDao.selectCurriculumClassifyById(id);
-        if(classifyDO.getTwoCourseId() == null && flyerTrainingDao.countTwoCourseClassify(classifyDO.getOneCourseId() ) > 1){
+        if(classifyDO == null){
+            return ResultBody.error("找不到这个课程分类，可能已经删除");
+        }
+        if(classifyDO.getTwoCourseId() == null  && flyerTrainingDao.countTwoCourseClassify(classifyDO.getOneCourseId() ) > 1){
            return ResultBody.error("有二级分类无法删除");
         }
         flyerTrainingDao.removeCurriculumClassify(id);