fix(list): fix extra exist check logic. close #831
fix(list): fix extra exist check logic. close #831

ant-design/ant-design-mobile,bccsafe/ant-design-mobile,ddcat1115/ant-design-mobile,ddcat1115/ant-design-mobile,ant-design/ant-design-mobile,bccsafe/ant-design-mobile,bccsafe/ant-design-mobile,ant-design/ant-design-mobile,ddcat1115/ant-design-mobile,bccsafe/ant-design-mobile,ant-design/ant-design-mobile,ddcat1115/ant-design-mobile,bccsafe/ant-design-mobile,ddcat1115/ant-design-mobile