1.优化采购需求excel导出格式，数据为0的单元格置空；

app/admin/models/purchase.go

@@ -3414,14 +3414,38 @@ func demandDataExport(list []DemandData) (string, error) {
 		}
 
 		for _, v := range list[i].StoreList {
-			row = append(row, v.LastMonthSales) // 上月销售数
-			row = append(row, v.StockCount)     // 库存数量
-			row = append(row, v.NeedCount)      // 需采购数
+			if v.LastMonthSales != 0 {
+				row = append(row, v.LastMonthSales) // 上月销售数
+			} else {
+				row = append(row, "")
+			}
+
+			if v.StockCount != 0 {
+				row = append(row, v.StockCount) // 库存数量
+			} else {
+				row = append(row, "")
+			}
+
+			if v.NeedCount != 0 {
+				row = append(row, v.NeedCount) // 需采购数
+			} else {
+				row = append(row, "")
+			}
 		}
 
-		row = append(row, list[i].TotalCount)  // 需采购总数量
-		row = append(row, list[i].TotalAmount) // 需采购总金额
-		row = append(row, list[i].Remark)      // 备注
+		if list[i].TotalCount != 0 {
+			row = append(row, list[i].TotalCount) // 需采购总数量
+		} else {
+			row = append(row, "")
+		}
+
+		if list[i].TotalAmount != 0 {
+			row = append(row, list[i].TotalAmount) // 需采购总金额
+		} else {
+			row = append(row, "")
+		}
+
+		row = append(row, list[i].Remark) // 备注
 
 		for j, _ := range row {
 			cell, _ := excelize.CoordinatesToCellName(1+j, nExcelStartRow+3)
@@ -3536,9 +3560,23 @@ func demandDataExportOnShopAssistant(list []DemandData) (string, error) {
 		}
 
 		for _, v := range list[i].StoreList {
-			row = append(row, v.LastMonthSales) // 上月销售数
-			row = append(row, v.StockCount)     // 库存数量
-			row = append(row, v.NeedCount)      // 需采购数
+			if v.LastMonthSales != 0 {
+				row = append(row, v.LastMonthSales) // 上月销售数
+			} else {
+				row = append(row, "")
+			}
+
+			if v.StockCount != 0 {
+				row = append(row, v.StockCount) // 库存数量
+			} else {
+				row = append(row, "")
+			}
+
+			if v.NeedCount != 0 {
+				row = append(row, v.NeedCount) // 需采购数
+			} else {
+				row = append(row, "")
+			}
 		}
 
 		row = append(row, list[i].Remark) // 备注