- fail if CO3Dv2 path is not given even if path_manager is None

Summary: ... see title

Reviewed By: bottler

Differential Revision: D38430103

fbshipit-source-id: fd0696da82c367b0f4d9c9d92c0cba0230834137

pytorch3d/implicitron/dataset/json_index_dataset_map_provider_v2.py

@@ -191,6 +191,8 @@ class JsonIndexDatasetMapProviderV2(DatasetMapProviderBase):  # pyre-ignore [13]
 
         if path_manager is not None:
             path_managed_frame_file = path_manager.get_local_path(frame_file)
+        else:
+            path_managed_frame_file = frame_file
         if not os.path.isfile(path_managed_frame_file):
             # The frame_file does not exist.
             # Most probably the user has not specified the root folder.