fix(service): 修复空列表处理避免空指针异常

buhuazhen

2026-04-22 252766e40f844145579317509cf5136a8e6d2de4

 src/main/java/com/ruoyi/purchase/service/IPurchaseLedgerService.java

@@ -43,4 +43,6 @@
    String getPurchaseNo();

    AjaxResult importData(MultipartFile file);

    PurchaseLedgerDto getPurchaseByCode(PurchaseLedgerDto purchaseLedgerDto);
}