DTXMania NX crashes when CLASSIC is enabled in Config.ini

[Villadelfia]

Steps to reproduce:
Set CLASSIC=1 in Config.ini.

Expected behavior:
The game does not crash.

Observed behavior:
The game crashes when you scroll onto the field in the song wheel and when you enter a folder and start scrolling.

[limyz]

Fixed in #109

[limyz]

See #113

[fisyher]

Fixed with a proper null check instead of using null-conditional operators, which is hard to read and should be avoided

[jaredmorgs]

Hah, so that is what was causing the game to crash.

I encountered this bug plenty of times but was unsure why the issue was happening, so thanks for tracking down the root cause @Villadelfia.

The only way I could resolve this was to rename my config and then have DTXMania re-create the config file again.
Then I had to reset all the settings from scratch because I didn't know which one caused the issue.

The exception error the app threw didn't really help me work out what the problem was as an end-user either, so this was a frustrating bug.

Thank you very much to all for tracking down the cause of the bug. 👍🏻