统计：处理会员性别统计，存在未知的情况

Author: owen118z

src/views/mall/statistics/member/index.vue

@@ -267,6 +267,7 @@ const getMemberAreaStatisticsList = async () => {
 const getMemberSexStatisticsList = async () => {
   const list = await MemberStatisticsApi.getMemberSexStatisticsList()
   const dictDataList = getIntDictOptions(DICT_TYPE.SYSTEM_USER_SEX)
+  dictDataList.push({ label: '未知', value: null } as any)
   sexChartOptions.series![0].data = dictDataList.map((dictData: DictDataType) => {
     const userCount = list.find((item: MemberSexStatisticsRespVO) => item.sex === dictData.value)
       ?.userCount