refactor: removes unreachable address verification code

[Justintime50]

Description

Removes some unreachable address verification code. If an error occurs during verification, we will fail earlier than this function in the stack (closer to the request) and therefore we don't need to check for the existence of the address key. I added a unit test to ensure that we still properly throw error when an invalid address is passed meaning this change doesn't affect user expectations.

Testing

Added a unit test for throwing errors on invalid address verifications

Pull Request Type

Please select the option(s) that are relevant to this PR.

• 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 not work as expected)
• Improvement (fixing a typo, updating readme, renaming a variable name, etc)