Infinite redirects to non-existent board

This seems tangentially related to issue #112 (closed)

Regardless, some steps taken to reproduce were as follows:

1. Log in to kanban board
2. Select appropriate board
3. Edit browser url to board which doesn't exist & press enter
4. Watch a disco light-show as your kanban continually tries to reload a non-existent board.

Some info: we're using the latest docker image. (I.e., we ran git pull and then the docker-compose listed in the README).

If any other info is needed, I'd be more than happy to provide it.