feat(consignmentInventory): add handling for empty original step price data

- Introduced a new flag to track if the original step price data returned from the backend is empty.
- Updated the input handling logic to allow unlimited order quantities when the original step price data is empty.
- Enhanced data retrieval logic to set the new flag based on the response from the API.

src/views/consignmentManagement/consignmentInventory.vue

@@ -415,6 +415,7 @@
                 priceData: [],//修改价格数据
                 message: {},
                 skuOriginalStepPriceData: [],
+                isOriginalStepPriceEmpty: false, // 后台返回的阶梯价数据是否为空
                 goods_id: '',
                 stock: 0,
                 tableData: [],
@@ -496,6 +497,8 @@
              * 监听起订量
              */
             handleInput(index) {
+                // 后台返回数据为空时，不限制起订量
+                if (this.isOriginalStepPriceEmpty) return;
                 var val = Number(this.skuOriginalStepPriceData[index].purchases) || 0;
                 var max = Number(this.stock) || 0;
                 if (val > max) {
@@ -844,6 +847,8 @@
                 this.$http('GET', "/api/sku/getSkuOriginalStepPrice", { goods_id: goods_id }).then(res => {
                     if (res.code == 0) {
                         this.skuOriginalStepPriceData = res.data.data;
+                        // 标记后台返回的阶梯价数据是否为空
+                        this.isOriginalStepPriceEmpty = !res.data.data || res.data.data.length === 0;
                         this.goods_id = goods_id;
                     } else {
                         this.$message({