[openstreetmap/openstreetmap-website] Redaction title can be blank. (#2033)

[William Drumheller]

@1v0ryh4t and I found that when creating a new redaction under `/redactions/new`, the redaction title is allowed to be blank. When attempting to view said redactions under `/redactions`, the new redaction is not present or viewable under the list as it's title or name is an empty string. I would like to add a validation to a `redaction` so that when creating or editing the `redaction`, the name can never be blank. (This seems like a decent `good-first-issue` for myself.)

Please see the attached images.

![notitleredactioncreation](https://user-images.githubusercontent.com/41215187/47397923-97684e00-d6ff-11e8-8e0c-b1267067f9a8.png)
![redactionsscreen](https://user-images.githubusercontent.com/41215187/47397929-9b946b80-d6ff-11e8-9e90-46f08170ace2.png)


All redactions (`/redactions'):

![redactions_list](https://user-images.githubusercontent.com/41215187/47398054-3a20cc80-d700-11e8-97ca-7b6729bb9671.png)


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