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Games without banners were not cached before, because a banner could become available at any time, making the cache outdated without it becoming invalidated. Instead of not caching anything, this change makes Dolphin check for a banner every time a cache that lacks a banner is read. This is faster than reading all metadata, because reading a Wii banner only reads from the game's save file, not the volume and its filesystem. The cache revision is incremented, because otherwise banners will be missing if a cache without a banner is created in the new version and the user switches to an old version and creates a savefile.