fix bugs

stmms-web/src/main/java/cn/com/qmth/stmms/admin/report/ReportSubjectRangeController.java

@@ -88,7 +88,8 @@ public class ReportSubjectRangeController extends BaseExamController {
         int examId = getSessionExamId(request);
         if (StringUtils.isNotBlank(query.getSubjectCode()) && query.getRange() != null) {
             ReportSubject subject = reportSubjectService.findOne(examId, query.getSubjectCode());
-            if (subject != null) {
+            if (subject != null && subject.getScoreRange() != null && subject.getTotalScore() != null
+                    && subject.getRealityCount() != null) {
                 model.addAttribute(
                         "total",
                         getScoreRange(subject.getScoreRange(), subject.getTotalScore(), subject.getRealityCount(),