Dataset: fix another bug revealed by pandas 1.0
@@ -442,7 +442,7 @@ class Dataset(Collection):
# Sort
sort_index = ["native"] + list(self.data.history_keys[:-1])
if "stoichiometry" in ret.columns:
- sort_index += ["stoichiometry"]
+ sort_index += ["stoichiometry", "name"]
ret.set_index(sort_index, inplace=True)
ret.sort_index(inplace=True)
ret.reset_index(inplace=True)
