Fred Saberhagen made this a plot point in one of his Berserker stories. Going by my highly suspect memory... A damaged Berserker captures an atlas showing an o

Fred Saberhagen made this a plot point in one of his Berserker stories. Going by my highly suspect memory... A damaged Berserker captures an atlas showing an occupied system nearby, and heads there with its last reserves of power to destroy the system. The human who didn't stop the Berserker is charged with a crime against sentience, but is acquitted when he reveals the secret: The occupied system was a fake, in the tradition of cartographers going back to the Middle Ages on Sol.