update

src/main/java/cn/com/qmth/scancentral/service/impl/SubjectServiceImpl.java

@@ -210,7 +210,7 @@ public class SubjectServiceImpl extends MppServiceImpl<SubjectDao, SubjectEntity
 //        List<SubjectScanProgressVo> subjects = studentService.scanProgress(examId, subjectCode);
 
         List<SubjectScanProgressVo> subjects = new ArrayList<>();
-        if(StringUtils.isBlank(subjectCode)){
+        if(StringUtils.isNotBlank(subjectCode)){
             SubjectEntity subject = this.findByExamIdAndCode(examId,subjectCode);
             SubjectScanProgressVo vo = new SubjectScanProgressVo();
             vo.setSubjectCode(subject.getCode());