[BUG] - [LINUX] - "Other" store platform causes app to hang when selecting game

[rofocalus]

Describe the bug
When selecting "other" for platform, rather than "steam", "epic games", etc, the application hangs and throws exception. Tested with "Voices of the Void", Among Us, Outward. This was seen on Arch Linux, other reports show it occurs on other Linux distros.

To Reproduce
Steps to reproduce the behavior:

1. Open r2modman
2. Click on Voices of the Void, or any game that has "other" option for platform
3. Application will hang before calling function for next screen, application will work as expected on same game if "steam" is selected for platform.

Expected behavior
Ability to select executable for game, on "other" platform.

Screenshots
Unable at the moment :(

Reported on Discord, adding here for visibility.