SERVER: Fix MB2 file parsing

[MotoLegacy]

Description of Changes

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Regression caused by removing if not instances since they throw FTEQCC warnings with -Wall. We were bailing out of the file parsing too soon.

Visual Sample

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N/A

Checklist

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• I have thoroughly tested my changes to the best of my ability
• I confirm I have not contributed anything that would impact Nazi Zombies: Portable's licensing and usage
• This Pull Request fixes a critical issue that should be reviewed and merged as soon as possible