check if file path is none before returning

objaverse_xl/thingiverse.py

@@ -156,9 +156,10 @@ def download_thingiverse_objects(
     if processes == 1:
         for item in tqdm(items_to_download):
             file_path = _download_item(item=item, download_dir=download_dir)
-            out.append(
-                {"filePath": file_path, **item,}
-            )
+            if file_path is not None:
+                out.append(
+                    {"filePath": file_path, **item,}
+                )
     else:
         args = [(item, download_dir) for item in items_to_download]
         with Pool(processes=processes) as pool:
@@ -173,6 +174,7 @@ def download_thingiverse_objects(
             [
                 {"filePath": file_path, **item,}
                 for item, file_path in items_and_file_paths
+                if file_path is not None
             ]
         )
     return out