Suppress ChainedAssignmentError

ChainedAssignmentError: A value is trying to be set on a copy of a DataFrame or Series through chained assignment using an inplace method.
When using the Copy-on-Write mode, such inplace method never works to update the original DataFrame or Series, because the intermediate object on which we are setting values always behaves as a copy.

src/sssom/parsers.py

@@ -425,7 +425,7 @@ def from_sssom_dataframe(
     # This is to address: A value is trying to be set on a copy of a slice from a DataFrame
     if CONFIDENCE in df.columns:
         df2 = df.copy()
-        df2[CONFIDENCE].replace(r"^\s*$", np.nan, regex=True, inplace=True)
+        df2[CONFIDENCE] = df2[CONFIDENCE].replace(r"^\s*$", np.nan, regex=True)
         df = df2
 
     mapping_set = _get_mapping_set_from_df(df=df, meta=meta)