修复tag落地页白板bug。

@@ -37,19 +37,25 @@ export default class List extends Component {
        });
      }
 
-    _renderHeader() {
-        if (this.props.type == 'editor') {
-            return null;
-        }
-        return (
-            <TouchableOpacity onPress={()=>{this.props.onPressHeader&&this.props.onPressHeader(this.props.resource.author.url)}}>
-            <View style={styles.headerContainer}>
-                <Image style={styles.avatar} source={{uri:this.props.resource.author.avatar}}/>
-                <Text style={styles.name}>Sphinx</Text>
-            </View>
-            </TouchableOpacity>
-        )
-    }
+     _renderHeader() {
+         let {author} = this.props.resource.toJS();
+         if (this.props.type == 'editor' || !author) {
+             return null;
+         }
+         let {
+             url,
+             avatar,
+             name
+         } = author;
+         return (
+             <TouchableOpacity onPress={()=>{this.props.onPressHeader&&this.props.onPressHeader(url)}}>
+             <View style={styles.headerContainer}>
+                 <Image style={styles.avatar} source={{uri:avatar}}/>
+                 <Text style={styles.name}>{name}</Text>
+             </View>
+             </TouchableOpacity>
+         )
+     }
 
     render() {
         let tagMap = {