Adding better error handling for database issues

[epag]

When we are unable to connect to a database report the reason why instead of wrapping and forgetting it. Also be more clear in the error message for failure cause and remove NPE

Changes Made

• Fix ambiguous error message with database connection issues

Testing

• manual testing

Related Tickets

• Fixes Null database is attempted to be used #32

Checklists

Deployment Plan (For developer use)

How does the changes affect the product?

• Feature addition
• Bug fix
• Database change

Issuer Checklist (For developer use)

You may update this checklist before and/or after creating the PR. If you're unsure about any of them, please ask, we're here to help! These items are what we are going to look for before merging your code.

• Informative and human-readable title, using the format: [_pt] PR: <description>
• Links are provided if this PR resolves an issue, or depends on another other PR
• The feature branch you're submitting as a PR is up to date
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• No Placeholder code
• Reviewers requested
• Add yourself as an assignee in the PR

Merge Checklist (For Technical Lead use only)

• If applicable, update README with major alterations