fix: 处理空值计算，确保待来票金额与未来票金额一致

gongchunyi

2026-01-16 79a570ae5f497e30337e7dd002450072e1b21cc2

 src/main/resources/mapper/purchase/ProductRecordMapper.xml

@@ -13,6 +13,7 @@
        pm.model AS product_model,
        pl.purchase_contract_number,
        pl.supplier_name,
        pl.project_name,
        pr.*,
        tr.invoice_number,
        tr.iss_uer_id,