fix(approve): 修复审批流程为空时的异常处理

liyong

2026-04-30 c2ad2126d6f8423e0a5e6e20bbb91ef6bb1cffc0

 src/main/java/com/ruoyi/purchase/dto/PaymentLedgerDto.java

@@ -8,6 +8,8 @@
    // 供应商名称
    private String supplierName;

    private Long supplierId;

    // 开始日期
    private String startDate;