edit

main/src/Journal.php

@@ -526,11 +526,11 @@ class Journal extends Core
         }
         $id = $this->check();
 
+        $this->data['buy_desc'] = $this->data['info']['buy_content'];
         # 获取购买说明
         $buy = Dever::db('journal/buy')->one(array('id' => $id));
 
-        $this->data['buy_desc'] = '';
-        if ($buy) {
+        if ($buy && $buy['buy_content']) {
             $this->data['buy_desc'] = $buy['buy_content'];
         }
 

main/src/Journal_v1.php

@@ -572,7 +572,7 @@ class Journal_v1 extends Core
         # 获取购买说明
         $buy = Dever::db('journal/buy')->one(array('id' => $id));
 
-        if ($buy) {
+        if ($buy && $buy['buy_content']) {
             $this->data['buy_desc'] = $buy['buy_content'];
         }