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/measuringinstrumentledger/pojo/MeasuringInstrumentLedger.java

@@ -142,6 +142,7 @@
    private String unit;

    @ApiModelProperty("部门id")
    @TableField(fill = FieldFill.INSERT)
    private Long deptId;

    @ApiModelProperty("安装位置")