Problem/Motivation
Accessing (as admin) a non-existing event details at admin/reports/dblog/event/ returns an empty page, it should return the 404 error page.
Proposed resolution
Throw NotFoundHttpException at the dblog controller for non-existing events.
Remaining tasks
Review path.
User interface changes
None.
API changes
None.
Data model changes
None.
Release notes snippet
TBD.
