bug修改

themis-backend/src/main/java/com/qmth/themis/backend/api/TIeInvigilateController.java

@@ -155,6 +155,9 @@ public class TIeInvigilateController {
     @RequestMapping(value = "/list/video/random", method = RequestMethod.POST)
     @ApiResponses({@ApiResponse(code = 200, message = "监考监控信息", response = InvigilateListVideoBean.class)})
     public Result listVideoRandom(@ApiParam(value = "考试批次id", required = false) @RequestParam(required = false) Long examId, @ApiParam(value = "随机数", required = true) @RequestParam Integer randomNum) {
+        if (Objects.isNull(randomNum) || Objects.equals(randomNum, "")) {
+            throw new BusinessException("随机数不能为空");
+        }
         TBUser tbUser = (TBUser) ServletUtil.getRequestAccount();
         AuthDto authDto = (AuthDto) redisUtil.get(SystemConstant.userOauth + "::" + tbUser.getId());
         //如果有监考员角色，只能查看自己所监考的考场，巡考员和管理员则可以查看全部考场