代码优化 review by chenlin

@@ -51,7 +51,7 @@ export default class HotCategoryList extends Component{
             return null;
         }
 
-		let imageUrl = SlicedImage.getSlicedUrl(rowData.get("default_images"), 98, 128, 2);
+		let imageUrl = SlicedImage.getSlicedUrl(rowData.get("default_images", ''), 98, 128, 2);
         return (
             <TouchableOpacity onPress={() => this.props.onPressHotCategoryItem && this.props.onPressHotCategoryItem(rowData.toJS(),rowID)}>
                 <View style={styles.rowContainer}>