Unlit tiles exploit

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I noticed this while at war with Charlemagne and my map was very out of date. Using the 'go to' command I hovered my cursor over some of the tiles and on one it showed the option to bombard (I had a stack of catapults+war elephants selected), indicating the presence of a city. This tile was out of my visibility and my map did not show a city there, but there was one.