fix

stmms-web/src/main/java/cn/com/qmth/stmms/api/controller/ExamPackageController.java

@@ -93,9 +93,9 @@ public class ExamPackageController extends BaseApiController {
                         obj.accumulate("examRoom", "");
                     } else {
                         ExamStudent student = query.getResult().get(0);
-                        obj.accumulate("examBatch", student.getExamBatch());
-                        obj.accumulate("examSite", student.getExamSite());
-                        obj.accumulate("examRoom", student.getExamRoom());
+                        obj.accumulate("examBatch", student.getExamBatch()==null?"":student.getExamBatch());
+                        obj.accumulate("examSite", student.getExamSite()==null?"":student.getExamSite());
+                        obj.accumulate("examRoom", student.getExamRoom()==null?"":student.getExamRoom());
                     }
                     array.add(obj);
                 }