[garydgregory]

Fix NIO error handling in visible and non-empty file filters (f009)

Negate status predicates before handling IOException so VISIBLE and NOT_EMPTY reject paths whose status cannot be determined.

Reuse PathUtils.isEmptyDirectory() for directory checks while preserving null and classic File behavior. Document the behavior and add regression tests for status, directory-open, directory-close, and missing-path errors.

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