fix:修复素币兑换清单榜单获取个人排行问题

@@ -157,6 +157,12 @@ func (dao *CashPoolDao) ExchangeCashListRanking(queryOptions map[string]interfac
 	if err := queryEmployee.Order("su_money DESC").Select(&retEmployee); err != nil {
 		return nil, err
 	}
+	var currentEmployee interface{}
+	if len(retEmployee) == 0 {
+		currentEmployee = nil
+	} else {
+		currentEmployee = retEmployee[0]
+	}
 
 	// 清单已兑换素币
 	var activityExchangedSuMoney float64
@@ -198,7 +204,7 @@ func (dao *CashPoolDao) ExchangeCashListRanking(queryOptions map[string]interfac
 	return map[string]interface{} {
 		"people": retPeople,   // 员工排行榜
 		"count": count,     // 计数
-		"currentEmployee": retEmployee[0],   // 当前员工排名
+		"currentEmployee": currentEmployee,   // 当前员工排名
 		"exchangedSuMoney": activityExchangedSuMoney,  // 清单已兑换素币
 		"exchangedCash": activityExchangedCash,   // 清单已兑换现金
 	}, nil