qt: Error if installing DLC without game. #1476
Merged
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Currently if you try to install DLC without the game installed first, it will install it incorrectly as if it is a game, because the logic to check for updates and DLC only happens if the game directory exists.
The whole game vs update vs DLC package install code could use some cleaning up in general to address logic holes like this, but to at least prevent the issue for now, error if the user attempts to install DLC without the game installed.