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

[sonarqubecloud]

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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@            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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