[Adamvalade]

Bug

AASXReader.read_into() raises KeyError: 'Could not find part ... in package' when a File element or the default thumbnail references a part that is not contained in the AASX package, even with failsafe=True. The object is already added to the object store at that point, so reading stops half-way and all remaining objects are lost. Our own AASXWriter produces such packages in failsafe mode when a supplementary file is missing from the file store, so the reader should accept them.

Fix

In AASXReader._add_supplementary_file(), the KeyError from self.reader.open_part() is now handled according to the failsafe flag, mirroring the existing error-handling conventions in this module and in AASXWriter:

• With failsafe=True, the missing part is logged as a warning and None is returned. The callers in _collect_supplementary_files() already handle None, so the File element / default thumbnail keeps its original reference and reading continues with the remaining elements and objects.
• With failsafe=False, a KeyError naming the missing supplementary file is raised (chained from the original error), preserving the previous exception type.

The try block is intentionally scoped to open_part() only, so unrelated exceptions from the supplementary file container (e.g. a KeyError raised inside a custom add_file() implementation) are not swallowed.

Regression tests

Added to AASXReaderTest in sdk/test/adapter/aasx/test_aasx.py, building packages without the referenced part via the failsafe writer:

• test_reading_with_missing_file: missing supplementary file of a File element in both failsafe modes (warning + fully preserved object and unchanged File.value with failsafe=True; KeyError with failsafe=False).
• test_reading_with_missing_default_thumbnail: same for a missing default thumbnail of an AAS in both failsafe modes.
• test_reading_missing_and_valid_supplementary_files: a missing file followed by a valid one; the valid file is still loaded (content type and content hash verified).

Verification

• Focused AASX tests: python -m unittest test.adapter.aasx.test_aasx — 22 tests OK.
• All adapter tests: python -m unittest discover -s test/adapter -t . — 85 tests OK (2 pre-existing schema-dependent skips).
• ruff check and mypy basyx test pass.

The full test suite was not run locally, since it requires a CouchDB service and downloaded AAS schemas that are only provided in CI.

Fixes #665