Merge branch 'feature/optimize' into 'master'

backend/controllers/CoinBannerController.php

@@ -30,7 +30,7 @@ class CoinBannerController extends BaseController
             $request = Yii::$app->request;
             $image_url    = $request->post('image_url', '');
             $banner_url  = $request->post('banner_url','');
-            if($image_url && $banner_url){
+            if($image_url){
                 $banner_item = new CoinBannerItem();
                 $banner_item->banner_url = $banner_url;
                 $banner_item->image_url = $image_url;