487: twilio settings check for local build

[jaydonkrooss]

Skip over the initialization of Twilio client when the settings are not set locally, and add some helpful logs.

Test Plan:

1. See if local build without Twilio settings runs properly
2. Try running the app with test Twilio settings
3. Verify that OTP texting service works with Twilio settings (this is what loads the notifications.py import)