[Fix] Cannot read properties of undefined (reading 'is_dlc')]

[Nocccer]

This PR makes sure that the frontend does not throw if something acces undefined object which contains is_dlc.
Every backend getGameInfo returns know an invalid GameInfo instead null.

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[arielj]

should we change the type of .install to be possibly undefined? because if this can be undefined it would be easy to run into this issue again in the future if typescript does not warn us about it and we forget

[Nocccer]

should we change the type of .install to be possibly undefined? because if this can be undefined it would be easy to run into this issue again in the future if typescript does not warn us about it and we forget

I tried another approach. Maybe that fixes it aswell. If you think the undefined way is better, let me know.

[flavioislima]

LGTM