修改 null crash bug review by daiqiang

@@ -151,7 +151,7 @@ export default class ProductListCell extends Component {
     render() {
         let {data, sourceType, similarIndex, rowID, style, needShopCar} = this.props;
         let name = data.get('product_name') ? data.get('product_name') : '';
-        let yh_exposureData = data.get('yh_exposureData', null)? data.get('yh_exposureData', null).toJS(): null;
+        let yh_exposureData = data && data.get('yh_exposureData') ? data.get('yh_exposureData').toJS() : {};
         let is_limitbuy = data.get('is_limitbuy') && data.get('is_limitbuy') == 'Y';
         let prd_id = data.get('product_id') ? data.get('product_id') : '';
         let isGlobal = data.get('is_global') && data.get('is_global') == 'Y'; // 是否全球购商品