闭包查询使用cache(true)抛出异常

lang/zh-cn.php

@@ -66,6 +66,7 @@ return [
     'relation data not exists'                                  => '关联数据不存在',
     'relation not support'                                      => '关联不支持',
     'chunk not support order'                                   => 'Chunk不支持调用order方法',
+    'closure not support cache(true)'                           => '使用闭包查询不支持cache(true)，请指定缓存Key',
 
     // 上传错误信息
     'unknown upload error'                                      => '未知上传错误！',

library/think/db/Query.php

@@ -2441,7 +2441,7 @@ class Query
         try {
             return md5($prefix . serialize($options) . serialize($bind));
         } catch (\Exception $e) {
-            return;
+            throw new Exception('closure not support cache(true)');
         }
     }