- fix a bug that would cause the runner to hit a fatal() when running out

	of luck under load. Long story made short: the runner process opens
	the queue and sequentially opens each bucket to process messages.
	If a message is delivered by MDA/MTA after the opendir(), then the
	queue process will garbage collect the message from the queue and
	the runner will attempt to opendir() a path that no longer exists.

	Reported by Daniel Lidberg <daniel.lidberg@gmail.com>, observed by
	jacekm@ and debugged by me, that's collaborative work ;-)

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