动态不存在要报错

application/api/controller/Topicdongtai.php

@@ -412,6 +412,8 @@ class Topicdongtai extends Api
             }else{
                 $info['topic_text'] = [];
             }
+        }else{
+            $this->error('此动态已被删除');
         }
 
         $this->success('success',$info);