Made forecast-period conditionCode optional

internal/normalizers/openmeteo/forecast.go

@@ -98,6 +98,7 @@ func buildForecast(parsed omForecastResponse, fallbackIssued time.Time) (model.W
 		}
 
 		wmo := wmoAt(parsed.Hourly.WeatherCode, i)
+		wmoPtr := wmoCodePtr(wmo)
 		canonicalText := standards.WMOText(wmo, isDay)
 
 		period := model.WeatherForecastPeriod{
@@ -107,7 +108,7 @@ func buildForecast(parsed omForecastResponse, fallbackIssued time.Time) (model.W
 			Name:  "",
 			IsDay: isDay,
 
-			ConditionCode:   wmo,
+			ConditionCode:   wmoPtr,
 			TextDescription: canonicalText,
 		}
 
@@ -237,3 +238,8 @@ func wmoAt(vals []*int, idx int) model.WMOCode {
 	}
 	return model.WMOUnknown
 }
+
+func wmoCodePtr(code model.WMOCode) *model.WMOCode {
+	out := code
+	return &out
+}