修改BUG

exam-work-api/src/main/java/cn/com/qmth/examcloud/service/examwork/service/ExamStudentService.java

@@ -727,8 +727,8 @@ public class ExamStudentService {
 	     long examTimes = examStudent.getExam().getExamTimes();
 	     if(examTimes > examStudent.getNormalExamTimes()){
 	        examStudent.setNormalExamTimes(examStudent.getNormalExamTimes()+1);
-	        examStudent.setIsReexamine(false);
-	        examStudent.setReexamineCompleted(false);
+	        examStudent.setIsReexamine(null);
+	        examStudent.setReexamineCompleted(null);
 	     }
 	     //考生开始重考时，将重考已完成设置为true
 	     if(examStudent.getIsReexamine()!=null&&examStudent.getIsReexamine()){