Optimize path assignment to handle point cloud in JSON without images (…

…#1649)

- Same as #1643 
- Apply this to release/1.10.0

CHANGELOG.md

@@ -21,6 +21,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   (<https://github.com/openvinotoolkit/datumaro/pull/1599>)
 - Update ov ir model for explorer openvino launcher with CLIP ViT-L/14@336px model
   (<https://github.com/openvinotoolkit/datumaro/pull/1603>)
+- Optimize path assignment to handle point cloud in JSON without images
+  (<https://github.com/openvinotoolkit/datumaro/pull/1643>)
 
 ### Bug fixes
 - Fix datumaro format to load visibility information from Points annotations

src/datumaro/plugins/data_formats/datumaro/base.py

@@ -183,8 +183,7 @@ def _parse_item(self, item_desc: Dict) -> Optional[DatasetItem]:
             pcd_info = item_desc.get("point_cloud")
             if media and pcd_info:
                 raise MediaTypeError(STR_MULTIPLE_MEDIA)
-            if pcd_info:
-                pcd_path = pcd_info.get("path")
+            if pcd_info and (pcd_path := pcd_info.get("path")):
                 point_cloud = osp.join(self._pcd_dir, self._subset, pcd_path)
 
                 related_images = None