Merge branch 'fix/registrations-confirm-email-doesnotexist' into 'master'

Ghost Userrequested to merge
cherry-pick-77d9b01c into release/1.16

Crash on confirming non-existing registration entry

Closes #665 (closed)

See merge request !867 (merged)

(cherry picked from commit 77d9b01c)

79f3b1f8 Rewrite ConfirmEmailViewTest to catch Entry.DoesNotExist f5865c99 Catch the right DoesNotExist exception in ConfirmEmailView

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