Merge remote-tracking branch 'origin/rescue' into rescue

dl-module-jx/src/main/java/cn/iocoder/yudao/module/base/service/impl/DlDriveSchoolCourseServiceImpl.java

@@ -141,6 +141,10 @@ public class DlDriveSchoolCourseServiceImpl extends ServiceImpl<DlDriveSchoolCou
     public void saveDriveSchoolCourse(DlDriveSchoolCourseNewVO courseVO) {
         boolean isNew = (courseVO.getId() == null);
 
+        if (courseVO.getCoachList().isEmpty()) {
+            throw new RuntimeException("新增课程时必须至少包含一个教练");
+        }
+
         DlDriveSchoolCourse course = BeanUtils.toBean(courseVO, DlDriveSchoolCourse.class);
 
         if (isNew) {