Crash on confirming non-existing registration entry

Ghost Userrequested to merge
fix/registrations-confirm-email-doesnotexist into master

Closes #665 (closed)

Previous behaviour

Steps to reproduce:

  1. Go to /registration/confirm-email/00000000-0000-0000-0000-000000000000
  2. 💥

New behaviour

Steps to validate that it works:

  1. Go to /registration/confirm-email/00000000-0000-0000-0000-000000000000
  2. Redirect to registration page

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