[BUGFIX] Hand event to view if failed

[georgringer]

Even if failed the event should be handed to the view

[derhansen]

Thanks for your PR. As discussed on TYPO3 slack, this may lead to a nullpointer exception, if the hmac check failed or if the event is hidden.

When the confirmation date expired, the event is available via the $registration variable. So basically, you can check in Fluid template as following <f:if condition="{event} || {registration.event}">Show event related data...</f:if>.

I therefore close the PR.