Add some sort of display

app.go

@@ -38,41 +38,43 @@ type StringResponse struct {
 	Error string `json:"error,omitempty"`
 }
 
-func (a *App) GetAddons() AddonsResponse {
-	return AddonsResponse{
-		Data:  addonService.Addons,
-		Error: "",
-	}
+func (a *App) GetAddons() (res AddonsResponse) {
+	res.Data = addonService.Addons
+	return res
 }
 
-func (a *App) GetAddon(name string) AddonResponse {
+func (a *App) GetAddon(name string) (res AddonResponse) {
 	addon, err := addonService.GetAddon(name)
-	return AddonResponse{
-		Data:  addon,
-		Error: err.Error(),
+	res.Data = addon
+	if err != nil {
+		res.Error = err.Error()
 	}
+	return res
 }
 
-func (a *App) GetAddonRemoteVersion(name string) StringResponse {
+func (a *App) GetAddonRemoteVersion(name string) (res StringResponse) {
 	version, err := addonService.GetRemoteVersion(name)
-	return StringResponse{
-		Data:  version,
-		Error: err.Error(),
+	res.Data = version
+	if err != nil {
+		res.Error = err.Error()
 	}
+	return res
 }
 
-func (a *App) GetAddonLocalVersion(name string) StringResponse {
+func (a *App) GetAddonLocalVersion(name string) (res StringResponse) {
 	version, err := addonService.GetLocalVersion(name)
-	return StringResponse{
-		Data:  version,
-		Error: err.Error(),
+	res.Data = version
+	if err != nil {
+		res.Error = err.Error()
 	}
+	return res
 }
 
-func (a *App) UpdateAddon(name string) AddonResponse {
+func (a *App) UpdateAddon(name string) (res AddonResponse) {
 	addon, err := addonService.UpdateAddon(name)
-	return AddonResponse{
-		Data:  addon,
-		Error: err.Error(),
+	res.Data = addon
+	if err != nil {
+		res.Error = err.Error()
 	}
+	return res
 }