- don't add download url if it's empty when calling MessageTemplateSend

platformapi/weixinapi/weixinapi.go

@@ -150,6 +150,9 @@ func (a *API) MessageTemplateSend(userOpneID, templateID, downloadURL string, mi
 		"url":         downloadURL,
 		"data":        data,
 	}
+	if downloadURL != "" {
+		bodyJson["url"] = downloadURL
+	}
 	if miniProgram != nil {
 		bodyJson["miniprogram"] = miniProgram
 	}