Rejected new tag doesn't produce any error message
Problem
There is no error message when trying to create an erroneous tag, from the "New Tag" page.
At the following path: /:user:/:project:/tags/new.
How to reproduce the bug
- try to create a new tag with a space character in it (let's say "my new tag")
- click on the "create tag" button
The user is brought back to the tag list. The new tag doesn't appear in the list. There is no error message available.