/usr/lib/python3.7/importlib/__init__.py:127: in import_module return _bootstrap._gcd_import(name[level:], package, level) <frozen importlib._bootstrap>:1006: in _gcd_import ??? <frozen importlib._bootstrap>:983: in _find_and_load ??? <frozen importlib._bootstrap>:953: in _find_and_load_unlocked ??? <frozen importlib._bootstrap>:219: in _call_with_frames_removed ??? <frozen importlib._bootstrap>:1006: in _gcd_import ??? <frozen importlib._bootstrap>:983: in _find_and_load ??? <frozen importlib._bootstrap>:967: in _find_and_load_unlocked ??? <frozen importlib._bootstrap>:677: in _load_unlocked ??? .tox/py3/lib/python3.7/site-packages/_pytest/assertion/rewrite.py:168: in exec_module exec(co, module.__dict__) .tox/py3/lib/python3.7/site-packages/swh/indexer/metadata_dictionary/__init__.py:11: in <module> from . import cff, codemeta, composer, dart, github, maven, npm, nuget, python, ruby <frozen importlib._bootstrap>:983: in _find_and_load ??? <frozen importlib._bootstrap>:967: in _find_and_load_unlocked ??? <frozen importlib._bootstrap>:677: in _load_unlocked ??? .tox/py3/lib/python3.7/site-packages/_pytest/assertion/rewrite.py:168: in exec_module exec(co, module.__dict__) .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'