fix

stmms-web/src/main/java/cn/com/qmth/stmms/admin/basic/OverviewController.java

@@ -36,8 +36,8 @@ public class OverviewController extends BaseExamController {
 		}else {
 			model.addAttribute("checkStudentOk", false);
 		}
-		model.addAttribute("checkSubjectOk", examSubjectService.checkSubjectForExport(examId));
-		model.addAttribute("checkAbsentOk", examSubjectService.checkSubjectAbsentForExport(examId));
+		model.addAttribute("checkSubjectOk", studentCount>0&&examSubjectService.checkSubjectForExport(examId));
+		model.addAttribute("checkAbsentOk", studentCount>0&&examSubjectService.checkSubjectAbsentForExport(examId));
 		return "modules/basic/overview";
 	}