Merge branch 'feature_HW_20230331' of http://git.dayaedu.com/yonge/mec into master_saas

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

@@ -156,14 +156,16 @@ public class LessonExaminationServiceImpl extends ServiceImpl<LessonExaminationD
                 vo.setOrganName(organNameMap.get(vo.getOrganId()));
                 vo.setMusicGroupName(musicGroupNameMap.get(vo.getMusicGroupId()));
                 vo.setTeacherName(teacherNameMap.get(vo.getTeacherId()));
-                if(vo.getExpectNum() > 1){
-                    StringBuffer sb = new StringBuffer(nameMap.get(vo.getId()));
-                    sb.append("等").append(vo.getExpectNum()).append("名学员");
-                    vo.setStudentNames(sb.toString());
-                }else {
-                    vo.setStudentNames(nameMap.get(vo.getId()));
+                String username = nameMap.get(vo.getId());
+                if(StringUtils.isNotEmpty(username)){
+                    if(vo.getExpectNum() > 1){
+                        StringBuffer sb = new StringBuffer(username);
+                        sb.append("等").append(vo.getExpectNum()).append("名学员");
+                        vo.setStudentNames(sb.toString());
+                    }else {
+                        vo.setStudentNames(username);
+                    }
                 }
-
             }
         }
         if (count == 0) {