fix: dont __bool__ a pd.Series

Author: dangotbanned

narwhals/_pandas_like/series.py

@@ -171,7 +171,7 @@ def _from_iterable(
             native_series_from_iterable(
                 data,
                 name=name,
-                index=index or [],
+                index=[] if index is None else index,
                 implementation=context._implementation,
             ),
             implementation=context._implementation,