fix: 查询对账明细，没有分配客户时返回空对象

src/main/java/com/uas/platform/b2b/controller/SaleApCheckController.java

@@ -195,7 +195,7 @@ public class SaleApCheckController {
 					distributes.add(v.getMyEnUU());
 				} 
 			} else {
-				return null;
+				return new ErpProdIo();
 			}
 		}
 		return erpProdIODetailService.findXlsApChecks(distributes, searchKeyWord, fromDate, endDate, checkDate);