P4-4128 & P4-4130 & P4-4129: error NoneType is not iterable

[baracudda]

For the Reviewer

• Code review complete
• Testing Complete
• Quality ORT App Documentation Updated (your name is in the Validator square for this feature)

When this is complete, you should approve the PR via github.

For the Reviewee

Summary

When checking for TEL in channel schemes to auto-allow International Calls, ensure it is not None first.

Breaking Changes

Fixed error when adding Nexmo(Vonage) and Twilio channels.

Quality Assurance

You have gathered the following items:

• This PR is tagged with a Release Milestone
• You have a log message clearly identifying when this feature is working successfully
• You have a log message clearly identifying when this feature is failing
• You added a PR against p4-alerting to trigger based on the failure condition above

Given all of the items above, you have updated your Application ORT at the following locations:

• Features and Alerting: Required.
• P4 Alerting: Required.

Testing and Verification

Test steps should now succeed for:

Nexmo(Vonage) channel

Twilio Channel

Telegram Channel