Fixed CodeFactor quality.

[ashleawalker29]

Description

Fixed 4 CodeFactor warnings to improve code quality and maintainability.

• Removed generic exception statements.
• Removed binding to all interfaces.
• Changed setting the SECRET_KEY to an empty string if it doesn't exist to raising an error.

Related Issue

Closes #38.

Motivation and Context

This improves code quality and code maintainability for future iterations of code.

How Has This Been Tested?

This has been tested locally and using the GitHub Actions workflow.

Types of changes

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.