fix: Reset attr types derived from empty simple types

[tefra]

📒 Description

When we process attribute types derived from simple types, that are incomplete due to a missing xsd, we should reset the type and log a warning like we do for all absent xs types.

Resolves #1059

🔗 What I've Done

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💬 Comments

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🛫 Checklist

• [ ] Updated docs
• [ ] Added unit-tests
• [ ] Sample tests pass
• [ ] W3C tests pass

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (3ad50f2) to head (6135e9a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1062 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 115 115 Lines 9234 9238 +4 Branches 2178 2179 +1 ========================================= + Hits 9234 9238 +4 ```

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