Made forecast-period conditionCode optional

internal/adapters/inbound/httpapi/presenter/helpers.go

@@ -5,6 +5,8 @@ package presenter
 import (
 	"math"
 	"time"
+
+	"gitea.maximumdirect.net/ejr/weatherfeeder/model"
 )
 
 func celsiusToFahrenheitPtr(v *float64) *float64 {
@@ -47,6 +49,14 @@ func copyTimePtr(v *time.Time) *time.Time {
 	return &out
 }
 
+func copyWMOCodePtr(v *model.WMOCode) *model.WMOCode {
+	if v == nil {
+		return nil
+	}
+	out := *v
+	return &out
+}
+
 func inLocationTime(v time.Time, loc *time.Location) time.Time {
 	if loc == nil {
 		return v