.tox/py3/lib/python3.7/site-packages/swh/indexer/metadata_dictionary/nuget.py:15: in <module> (CODEMETA_TERMS, NUGET_TABLE) = _read_crosstable(fd) .tox/py3/lib/python3.7/site-packages/swh/indexer/codemeta.py:87: in _read_crosstable canonical_name = make_absolute_uri(local_name) .tox/py3/lib/python3.7/site-packages/swh/indexer/codemeta.py:67: in make_absolute_uri assert uri.startswith(("@", CODEMETA_URI, SCHEMA_URI)), (local_name, uri) E AttributeError: 'NoneType' object has no attribute 'startswith'