Use proper exception in lostController

Use proper exception in lostController

There is no need to log the expcetion of most of the stuff here.
We should properly log them but an exception is excessive.

This moves it to a proper exception which we can catch and then log.
The other exceptions will still be fully logged.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>