refactor(wms/transfer): 简化调拨子表数据预处理逻辑

移除冗余的isEmpty判断分支，改用空值合并运算符统一处理前后字段赋值，优化代码可读性和维护性

klp-ui/src/views/wms/move/components/tranferItemTable.vue

@@ -167,8 +167,6 @@ export default {
         if (newVal !== oldVal) {
           // 预处理数据
           this.tableData = newVal.map(item => {
-            const isEmpty = this.isEmpty(item);
-            if (isEmpty) {
             return {
               ...item,
               oBefore: {
@@ -180,33 +178,19 @@ export default {
                 zincLayer: item.zincLayerBefore
               },
               oAfter: {
-                  manufacturer: item.manufacturerAfter,
+                manufacturer: item.manufacturerAfter ?? item.manufacturerBefore,
-                  specification: item.specificationAfter,
+                specification: item.specificationAfter ?? item.specificationBefore,
-                  material: item.materialAfter,
+                material: item.materialAfter ?? item.materialBefore,
-                  itemName: item.materialNameAfter,
+                itemName: item.materialNameAfter ?? item.materialNameBefore,
-                  surfaceTreatmentDesc: item.surfaceTreatmentAfter,
+                surfaceTreatmentDesc: item.surfaceTreatmentAfter ?? item.surfaceTreatmentBefore,
-                  zincLayer: item.zincLayerAfter
+                zincLayer: item.zincLayerAfter ?? item.zincLayerBefore
               },
+              // 每个字段独立判断：如果after有值则用after，否则回退到before
+              itemIdAfter: item.itemIdAfter ?? item.itemIdBefore,
+              warehouseIdAfter: item.warehouseIdAfter ?? item.warehouseIdBefore,
+              materialTypeAfter: item.materialTypeAfter ?? item.materialTypeBefore,
               isConfirmed: this.isConfirmed(item)
             }
-            } else {
-              return {
-                ...item,
-                oBefore: {
-                  manufacturer: item.manufacturerBefore,
-                  specification: item.specificationBefore,
-                  material: item.materialBefore,
-                  itemName: item.materialNameBefore,
-                  surfaceTreatmentDesc: item.surfaceTreatmentBefore,
-                  zincLayer: item.zincLayerBefore
-                },
-                // 将三个after字段设置为与before相同
-                itemIdAfter: item.itemIdBefore,
-                warehouseIdAfter: item.warehouseIdBefore,
-                materialTypeAfter: item.materialTypeBefore,
-                isConfirmed: this.isConfirmed(item)
-              }
-            }
           });
         }
       },
@@ -226,10 +210,6 @@ export default {
       // return item && item.itemIdAfter && item.warehouseIdAfter && item.materialTypeAfter
       return item.isTransferred == 1
     },
-    // isEmpty 是否为空
-    isEmpty(item) {
-      return item && item.itemIdAfter && item.warehouseIdAfter && item.materialTypeAfter
-    },
     handleUpdate(row) {
       updateTransferOrderItem(row).then(res => {
         this.$message({