fix：服务指标搜索繁忙

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

@@ -84,7 +84,7 @@ public class StudentExtracurricularExercisesSituationServiceImpl extends BaseSer
 //				exercisesSituationDto.setExpectExercisesNum((int) until+1);
 				List<UserGroupDto> userGroupDtos = userGroupsMap.get(exercisesSituationDto.getStudentId());
 				if(!CollectionUtils.isEmpty(userGroupDtos)){
-					exercisesSituationDto.setGroupNames(userGroupDtos.stream().map(UserGroupDto::getGroupName).sorted().collect(Collectors.joining(",")));
+					exercisesSituationDto.setGroupNames(userGroupDtos.stream().filter(ug->StringUtils.isNotBlank(ug.getGroupName())).map(UserGroupDto::getGroupName).sorted().collect(Collectors.joining(",")));
 				}
 				List<StudentEduTeacherDto> studentEduTeachers = studentEduTeachersMap.get(exercisesSituationDto.getStudentId());
 				if(!CollectionUtils.isEmpty(studentEduTeachers)){