Re: JSON unmarshal with proc to()

[Yardanico]

If "alerts" might not exist, you need to wrap it in Option (see `options` 
module in stdlib) like
    
    
    WeatherForecast = ref object
          latitude: float64
          longitude: float64
          timezone: string
          currently: Currently
          daily: Daily
          alerts: Option[seq[Alerts]]
    
    
    Run

and then, after using json.to, check if it's present by 
`myobj.alerts.isSome()`, and if it is, get the value by `myobj.alerts.get()`