distances.evaluate()
File "/tmp/pydelta/delta/deltas.py", line 787, in evaluate
result["Simple Score"] = self.simple_score()
File "/tmp/pydelta/delta/deltas.py", line 772, in simple_score
in_group_df, out_group_df = self.z_scores().partition()
File "/tmp/pydelta/delta/deltas.py", line 731, in z_scores
return DistanceMatrix((self - deltas.mean()) / deltas.std(),
File "/tmp/pydelta/.venv/lib/python3.8/site-packages/pandas/core/ops/__init__.py", line 660, in f
new_data = dispatch_to_series(self, other, op)
File "/tmp/pydelta/.venv/lib/python3.8/site-packages/pandas/core/ops/__init__.py", line 266, in dispatch_to_series
return type(left)(bm)
File "/tmp/pydelta/delta/deltas.py", line 630, in __init__
self.metadata = Metadata(metadata, **kwargs)
File "/tmp/pydelta/delta/util.py", line 31, in __init__
self.update(*args, **kwargs)
File "/tmp/pydelta/delta/util.py", line 84, in update
self._update_from(arg)
File "/tmp/pydelta/delta/util.py", line 53, in _update_from
self.__dict__.update(d)
TypeError: 'NoneType' object is not iterable