Update all os.environ dict calls to os.getenv calls

[nishant-nayak]

Description

Update all os.environ dict calls to os.getenv calls. This is a safer method of calling environment variables because getenv returns None if the variable doesn't exist.

Fixes #31

Dependencies

N/A

Type of Change

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• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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• Tested locally

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Checklist

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• New and existing unit tests pass locally with my changes

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