AttributeError when publishing OSI artifacts

[rezib]

This error has been seen in fatbuildrd logs when publishing OSI artifacts in registry:

fatbuildrd[329058]: Exception in thread worker-default:
fatbuildrd[329058]: Traceback (most recent call last):
fatbuildrd[329058]:   File "/usr/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
fatbuildrd[329058]:     self.run()
fatbuildrd[329058]:   File "/usr/lib/python3.10/threading.py", line 953, in run
fatbuildrd[329058]:     self._target(*self._args, **self._kwargs)
fatbuildrd[329058]:   File "/usr/lib/python3/dist-packages/fatbuildr/cli/fatbuildrd.py", line 133, in _worker
fatbuildrd[329058]:     instance.tasks_mgr.run(task)
fatbuildrd[329058]:   File "/usr/lib/python3/dist-packages/fatbuildr/tasks/manager.py", line 177, in run
fatbuildrd[329058]:     task.run()
fatbuildrd[329058]:   File "/usr/lib/python3/dist-packages/fatbuildr/builds/__init__.py", line 227, in run
fatbuildrd[329058]:     self.registry.publish(self)
fatbuildrd[329058]:   File "/usr/lib/python3/dist-packages/fatbuildr/registry/formats/osi.py", line 71, in publish
fatbuildrd[329058]:     logger.debug("Found files: %s", ' '.join(built_files.name))
fatbuildrd[329058]: AttributeError: 'list' object has no attribute 'name'