import-game with DLC AppNames allows for installing DLCs with no base game

[CommandMC]

Platform

Operating system and version: EndeavourOS
Legendary version (legendary -V): 0.20.12 (maintainer hasn't shipped .13 yet, same issue applies)

Current Behavior

When running import-game with a DLC's AppName, it's not checked that the base game is installed (it also refers to everything as "game", but that's minor). When then running repair, this DLC can then be installed, even though the base game doesn't exist. This contradicts the behavior for install, which doesn't allow for DLC installation when the base game isn't found.

Expected Behavior

Either import-game or repair should check if the AppName specified is a DLC, and check for the base game

Steps to Reproduce

1. Run legendary import-game AppNameOfDlc /path/to/any/dir without having the base game installed
2. Run legendary repair AppNameOfDlc

[CommandMC]

Additionally, repair will not actually do anything. It'll download a bit, say that it finished, but running repair again will report the same files as missing and start the same download again