修复导入评卷分组时试评数量为空时空指针，试评数量为空时默认导入试评数量是0

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

@@ -73,7 +73,7 @@ public class SubjectQuestionDTO {
                     groups.put(question.getGroupNumber(), group);
                 }
                 group.getImportQuestionList().add(question);
-                this.trialCount = question.getTrialCount();
+                this.trialCount = question.getTrialCount() == null ? 0 : question.getTrialCount();
                 // group.setTotalScore(group.getTotalScore() +
                 // question.getTotalScore());
                 // totalScore += question.getTotalScore();