a0e1eafc35
Also, retrieve tag from the request instead of the query (which will be the same but it's more easy to test).
Moved down `deleteTagAction` because it conflicted with the new action:
api_delete_tag => /api/tags/{tag}.{_format}
api_delete_tags_label => /api/tags/label.{_format}
And finally, throw exception when a tag is not found before removing it.