added more logging

[riley206]

Description

Added more error logging in the emailer agent to help users understand what went wrong.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• emails sent out when running send_email.py
• Errors printing when certain configuration values are messed up

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes