修复 None 导致的 xss filter 错误
修复 None 导致的 xss filter 错误

wangmingjob/OnlineJudge,Timeship/OnlineJudge-QDU,Timeship/OnlineJudge-QDU,wangmingjob/OnlineJudge,wangmingjob/OnlineJudge,Timeship/OnlineJudge-1,Timeship/OnlineJudge-1,Timeship/OnlineJudge-1,Timeship/OnlineJudge-1,Timeship/OnlineJudge-QDU,Timeship/OnlineJudge-QDU,wangmingjob/OnlineJudge