fix(bpm): 修复报销单据中部门名称为空时的空指针异常

- 在获取 paymentCompanyName 时，增加对 deptMap 中值的空值检查
- 避免在 deptMap 中不存在对应部门时抛出空指针异常
- 优化代码的健壮性和异常处理

yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/service/oa/BpmOAReimbursementServiceImpl.java

@@ -362,7 +362,8 @@ public class BpmOAReimbursementServiceImpl extends BpmOABaseService implements B
         List<ReimbursementDTO> reimbursementDTOS = BeanUtils.toBean(reimbursements, ReimbursementDTO.class);
 
         BpmOAReimbursementRespVO bpmOAReimbursementRespVO = BeanUtils.toBean(reimbursementDO, BpmOAReimbursementRespVO.class);
-        bpmOAReimbursementRespVO.setPaymentCompanyName(deptMap.get(reimbursementDO.getPaymentCompany()).getName());
+        DeptRespDTO deptRespDTO = deptMap.get(reimbursementDO.getPaymentCompany());
+        bpmOAReimbursementRespVO.setPaymentCompanyName(deptRespDTO == null ? null : deptRespDTO.getName());
         bpmOAReimbursementRespVO.setReimbursements(BpmOAReimbursementConvert.INSTANCE.convertList(reimbursementDTOS, deptMap));  //拼接数据
 
         return bpmOAReimbursementRespVO;