Crash on missing source in artifact.yml

[rezib]

± fatbuildrctl patches -a systemd-mkosi
Traceback (most recent call last):
  File "/usr/bin/fatbuildrctl", line 33, in <module>
    sys.exit(load_entry_point('Fatbuildr==2.1.0.dev158', 'console_scripts', 'fatbuildrctl')())
  File "/usr/lib/python3/dist-packages/fatbuildr/cli/__init__.py", line 34, in run
    cls()
  File "/usr/lib/python3/dist-packages/fatbuildr/cli/fatbuildrctl.py", line 583, in __init__
    args.func(args)
  File "/usr/lib/python3/dist-packages/fatbuildr/cli/fatbuildrctl.py", line 1260, in _run_patches
    patch_queue.run()
  File "/usr/lib/python3/dist-packages/fatbuildr/patches.py", line 97, in run
    source.id, self._dl_tarball(source)
  File "/usr/lib/python3/dist-packages/fatbuildr/patches.py", line 151, in _dl_tarball
    tarball_path = cache_dir.joinpath(source.filename(self.derivative))
  File "/usr/lib/python3/dist-packages/fatbuildr/artifact.py", line 141, in filename
    self._raw_source, version=self.version(derivative)
  File "/usr/lib/python3/dist-packages/fatbuildr/artifact.py", line 125, in _raw_source
    return self.defs['source']
KeyError: 'source'