Frontend: application behavior when a non-existing election ID is used

[cikzh]

As discussed here: #146 (comment) a user might end up using a non-existing election ID, for example by providing a wrong ID via the URL. This can happen in multiple places in the application, but /{id}/input might be an obvious place to test this.

• What should the behavior be when the election doesn't exist?
• Determine how to implement this
• Determine how to test this

[praseodym]

404 page?

[praseodym]

@jorisleker might have a good answer to this :)

[jorisleker]

404 page with a text like this?

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