Visiting the url of a webhook you don't own causes 500 error

[chrismytton]

Problem

When signed in, trying to visit the url of someone else's webhook gives a 500 error.

Steps to reproduce

1. Go to https://everypolitician-app-manager.herokuapp.com/ and sign in
2. Visit the url of a webhook you don't own (but does exist), e.g. https://everypolitician-app-manager.herokuapp.com/webhooks/1
3. 500 error

Proposed solution

I'm not sure exactly what's causing the 500 error, but that should be fixed and visiting other people's webhooks should return either a 404 (or possibly a 401).

Acceptance criteria

Following the steps to reproduce above should give a nice 404 page

Related issues

• Make pretty/informative/helpful 500 page(s) Make pretty/informative/helpful 500 page(s) #71