fix: 处理null问题

buhuazhen

2026-06-01 facbfd2b1a0eb1ea971b699def8c85a43c5fa7fa

 src/main/java/com/ruoyi/sales/dto/InvoiceRegistrationDto.java

@@ -23,4 +23,7 @@
    @ApiModelProperty(name = "合同金额")
    private BigDecimal contractAmount;

    @ApiModelProperty(name = "未开票金额")
    private BigDecimal noInvoiceAmountTotal;

}