proc: Don't report error in case fdinfo for epoll fd is empty
proc: Don't report error in case fdinfo for epoll fd is empty

This is normal situation -- eventpoll fd may have no fds attached
thus resulting in empty fdinfo file. Report OK in that case.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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