fix linter

tests/core/data/test_excel_data_node.py

@@ -270,7 +270,6 @@ class TestExcelDataNode:
         assert len(data_modin) == 6
         assert np.array_equal(data_modin.to_numpy(), pd.read_excel(path, header=None).to_numpy())
 
-
     @pytest.mark.parametrize(
         "content,columns",
         [

tests/core/data/test_parquet_data_node.py

@@ -135,7 +135,6 @@ class TestParquetDataNode:
         dn = ParquetDataNode("foo", Scope.SCENARIO, DataNodeId("dn_id"), properties=properties)
         assert os.path.exists(dn.path) is exists
 
-
     @pytest.mark.parametrize("engine", __engine)
     def test_read_file(self, engine, parquet_file_path):
         not_existing_parquet = ParquetDataNode(