Update `check_restricted_ip()` error-handling code

[jeffkause]

🗣 Description

This PR fixes a bug in the error handling code of the check_restricted_ip() function.

💭 Motivation and context

This bug prevents us from being able to add IPs that don't exist in our geoIP DB.

Resolves #92.

🧪 Testing

I tested the changes to geoloc.py in my development environment by:

1. Running the cyhy-ip command below against IP addresses that don't exist in the geoIP DB
2. Comparing the results against past results; verifying the correct results
3. Running the cyhy-ip command below against other IP addresses and CIDRs to assure the results provided the expected results

Expected results verified:

cyhy-ip add TEST_ENTITY <IP address>
IPs added to request, and initialized.  Tally sync required to start scan of new IPs.▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶▶| ETA:  0:00:00

✅ Pre-approval checklist

• [x] This PR has an informative and human-readable title.
• [x] Changes are limited to a single goal - eschew scope creep!
• [x] All relevant type-of-change labels have been added.
• [x] I have read the CONTRIBUTING document.
• [x] These code changes follow cisagov code standards.
• [x] All new and existing tests pass.

✅ Post-merge checklist

• [ ] Notify team to update local cyhy-core image.