Fix some assorted lints (#8460)

### What

Not sure what changed to cause me to start hitting these locally in my
pre-push hook, but they all seem valid.

examples/python/arkit_scenes/arkit_scenes/download_dataset.py

@@ -7,7 +7,7 @@
 import subprocess
 import zipfile
 from pathlib import Path
-from typing import Final
+from typing import Final, Optional
 
 import pandas as pd
 
@@ -196,14 +196,14 @@ def download_laser_scanner_point_clouds(laser_scanner_point_cloud_id: str, visit
         download_file(file_url, filename, laser_scanner_point_clouds_folder_path)
 
 
-def get_metadata(dataset: str, download_dir: Path) -> pd.DataFrame:
+def get_metadata(dataset: str, download_dir: Path) -> Optional[pd.DataFrame]:
     filename = "metadata.csv"
     url = f"{ARkitscense_url}/threedod/{filename}" if "3dod" == dataset else f"{ARkitscense_url}/{dataset}/{filename}"
     dst_folder = download_dir / dataset
     dst_file = dst_folder / filename
 
     if not download_file(url, filename, dst_folder):
-        return
+        return None
 
     metadata = pd.read_csv(dst_file)
     return metadata
@@ -235,7 +235,7 @@ def download_data(
 
     """
     metadata = get_metadata(dataset, download_dir)
-    if None is metadata:
+    if metadata is None:
         print(f"Error retrieving metadata for dataset {dataset}")
         return
 

rerun_py/rerun_sdk/rerun/_send_columns.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import Iterable, Protocol, TypeVar, Union
+from typing import Iterable, Protocol, TypeVar
 
 import pyarrow as pa
 import rerun_bindings as bindings
@@ -121,7 +121,7 @@ def as_arrow_array(self) -> pa.Array:
 def send_columns(
     entity_path: str,
     times: Iterable[TimeColumnLike],
-    components: Iterable[Union[ComponentBatchLike]],
+    components: Iterable[ComponentBatchLike],
     recording: RecordingStream | None = None,
     strict: bool | None = None,
 ) -> None:

rerun_py/rerun_sdk/rerun/archetypes/image_ext.py

@@ -18,6 +18,8 @@
 from ..error_utils import _send_warning_or_raise, catch_and_log_exceptions
 
 if TYPE_CHECKING:
+    from PIL import Image as PILImage
+
     ImageLike = Union[
         npt.NDArray[np.float16],
         npt.NDArray[np.float32],
@@ -30,18 +32,23 @@
         npt.NDArray[np.uint32],
         npt.NDArray[np.uint64],
         npt.NDArray[np.uint8],
+        PILImage.Image,
     ]
     from . import EncodedImage, Image
 
 
 def _to_numpy(tensor: ImageLike) -> npt.NDArray[Any]:
+    from PIL import Image as PILImage
+
     # isinstance is 4x faster than catching AttributeError
     if isinstance(tensor, np.ndarray):
         return tensor
+    if isinstance(tensor, PILImage.Image):
+        return np.array(tensor, copy=False)
 
     try:
         # Make available to the cpu
-        return tensor.numpy(force=True)  # type: ignore[union-attr]
+        return tensor.numpy(force=True)  # type: ignore[union-attr, no-any-return]
     except AttributeError:
         return np.array(tensor, copy=False)