修改评卷员导出时finishCount和finishCountNa字段为空时的报错，设置默认值为0

stmms-web/src/main/java/cn/com/qmth/stmms/admin/dto/MarkerInfoDTO.java

@@ -47,8 +47,8 @@ public class MarkerInfoDTO {
         setGroupNumber(String.valueOf(group.getNumber()));
         setLoginName(marker.getUser().getLoginName());
         setName(marker.getUser().getName());
-        setMarkedCount(marker.getFinishCount());
-        setMarkedCountNa(marker.getFinishCountNa());
+        setMarkedCount(marker.getFinishCount() != null ? marker.getFinishCount() : 0);
+        setMarkedCountNa(marker.getFinishCountNa() != null ? marker.getFinishCountNa() : 0);
         setEmpno(marker.getUser().getEmpno());
     }