beego controller响应json时如何忽略空值

beego controller响应json时如何忽略空值：如

{
    "Id": 0,
    "Account": "admin",
    "Password": "",
    "RoleId": 0,
    "Status": "",
    "CreateTime": "0001-01-01T00:00:00Z",
    "CreateUserId": 0,
    "UpdateTime": "0001-01-01T00:00:00Z",
    "UpdateUserId": 0
}

零值数据不返回 只返回 {“Account”:"admin"}

代码：

func (this *AdminManageController) GetCurrentSysAdmin() {
    var uid = this.GetSession("uid")
    this.Ctx.Output.JSON(entity.SysAdmin{Account:uid.(string)}, true, false)
}