User is able to save untagged way

[danieldegroot2]

User was able to save temporary guideline / placeholder line at https://www.openstreetmap.org/edit?way=1384443332#map=20/51.8626520/4.4748570 ( is: https://www.openstreetmap.org/way/1384443332/history )

Prohibit users from saving empty / tagless objects. They should go back to select a preset / tag (key+value) first before uploading. (see also iD / JOSM returns 'error' warning on saving changeset.)

Go Map!! 4.3.2 (iPhone); ask changeset author for details if needed