fix(invoice):添加重复校验标志变量

src/views/purchasingManage/purchaseOrder/invoice/components/addInvoiceDialog.vue

@@ -515,6 +515,7 @@
           let commitData = Object.assign({}, this.form, {
             productList: this.$refs.inventoryTableref.getTableValue()
           });
+          let is = false;
           productList.forEach((v, i) => {
             productList.forEach((v2, j) => {
               if (