fix bug

app/controller/Article.php

@@ -92,6 +92,7 @@ class Article
             ->limit(env("page_count"))
             ->select();
         foreach($lists as $vo){
+            $vo['imgs'] = "";
             if(!empty($vo['imgs'])) {
                 $vo['imgs'] = json_decode(str_replace(['{', '}'], ['[', ']'], $vo['imgs']), true);
                 $vo['imgs']= $vo['imgs'][0];