bug fix

examcloud-core-oe-student-service/src/main/java/cn/com/qmth/examcloud/core/oe/student/service/impl/ExamControlServiceImpl.java

@@ -754,7 +754,7 @@ public class ExamControlServiceImpl implements ExamControlService {
         }
 
         //考生id为空时，需要给考生id重新赋值
-        if (req.getExamRecordDataId() == null) {
+        if (req.getExamStudentId() == null) {
             ExamRecordData examRecordData = examRecordDataService.getExamRecordDataCache(req.getExamRecordDataId());
             req.setExamStudentId(examRecordData.getExamStudentId());
         }