fix: 发货审核异常未回滚导致的脏数据，添加判空操作

gongchunyi

昨天 2aa97d1237b7f720b33f9952f9901ddf7ae9833a

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

@@ -39,4 +39,6 @@
    List<InvoiceRegistrationProduct> getProductBySalesNo(Long id);

    String getPurchaseNo();

    int addPurchaseTemplate(PurchaseLedgerDto purchaseLedgerDto) throws IOException;
}