Merge branch '2020-717-formal'

src/components/activity/2020-717/activity/index.js

@@ -517,7 +517,7 @@ class Anniversary2020 extends Component {
         if (code === 200) {
           this.setState((state, props) => {
             return {
-              bulletScreenList: state.bulletScreenList.concat(data),
+              bulletScreenList: state.bulletScreenList.concat(Array.isArray(data) ? data : []),
             }
           });
 
@@ -1059,7 +1059,7 @@ class Anniversary2020 extends Component {
               })
             }
             {
-              auditions.length > 4 &&
+              auditions.length === 4 &&
               <li>
                 <button className={'show-more'} onClick={() => {
                   this.setState({