Apply suggestions from code review

Co-authored-by: Xiao Yuan <yuanx749@gmail.com>

Author: kleinhenz

pandas/io/parquet.py

@@ -245,12 +245,12 @@ def read(
         dtype_backend: DtypeBackend | lib.NoDefault = lib.no_default,
         storage_options: StorageOptions | None = None,
         filesystem=None,
-        to_pandas_kwargs=None,
+        to_pandas_kwargs: dict[str, Any] | None = None,
         **kwargs,
     ) -> DataFrame:
         kwargs["use_pandas_metadata"] = True
 
-        to_pandas_kwargs = to_pandas_kwargs if to_pandas_kwargs is not None else {}
+        to_pandas_kwargs = {} if to_pandas_kwargs is None else to_pandas_kwargs
         if dtype_backend == "numpy_nullable":
             from pandas.io._util import _arrow_dtype_mapping