Fix Property enumeration without local entries

[PHJ2000]

Remove the isEmpty() guard before enumerating Properties. Defaults are visible through propertyNames() and getProperty() even when there are no local entries.

Adds coverage for inherited defaults and local overrides. Maven clean verify passes with deployment signing disabled (-Dgpg.skip=true): 811 tests, 6 skipped.

Fixes #1086.

[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

See analysis details on SonarQube Cloud

[stleary]

What problem does this code solve?
Fixes a bug in Property parsing where inherited values without a local entry are missed.

Risks
Low

Changes to the Existing Behavior
Yes, minor change to behavior. Property parsing is not widely used. Inherited properties are now parsed. This bug goes back to the original implementation, and appears to be a simple omission.

Changes to the API
No

Will this require a new release?
No

Should the documentation be updated?
No

Unit Tests
New unit tests were added

Refactoring
APPROVED

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Review status