remove undefined dependencies and unused error re-raises. Add more ve…

[mattjfan]

…rbose error message on exception, remove unused import in application.py

[mattjfan]

Changes

• removed error re-raise and handling from send_push_message in push_notification.py
• added more verbose error logging to send_push_message error catch in report_sickness.py
• removed unused import application.py

Why

push_notification.py was calling undefined methods from the tutorial code, and referencing an undefined self property from global scope. In the case that an error was thrown from send_push_message, our code will run these undefined methods which will throw an error. I'm pretty sure since this whole thing is wrapped in a try catch block anyways, it doesn't crash the app, but I think it qualifies as unintended behavior. With the refactor, all errors thrown by exponent push methods are caught and logged without re-throwing, and the code can be simplified

Testing

@ChrisBarnes01 can you verify this still works as expected? You said you tested our push code previously so I figured it'd be easiest for you to verify.