fix: 处理null问题

buhuazhen

2026-06-01 facbfd2b1a0eb1ea971b699def8c85a43c5fa7fa

 src/main/java/com/ruoyi/sales/service/InvoiceLedgerService.java

@@ -104,4 +104,11 @@
     * @return
     */
    InvoiceRegistrationProductDto invoiceLedgerProductDetail(Integer id);

    /**
     * 开票台账删除
     * @param invoiceRegistrationProductId
     * @return
     */
    void delInvoiceLedger(Integer invoiceRegistrationProductId);
}