Update src/cehrbert/data_generators/hf_data_generator/cache_util.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: ChaoPang

src/cehrbert/data_generators/hf_data_generator/cache_util.py

@@ -30,7 +30,9 @@ def get_dataset_version_folder(file_name: str) -> Optional[str]:
                 found_dataset_folder = True
                 break
             parents.append(str(p))
-        assert len(parents) >= 2, f"the number of parents must be greater and equal than 2 for {file_name}"
+        if len(parents) < 2:
+            LOG.warning(f"the number of parents is less than 2 for {file_name}")
+            return None
         if (parents[-1].endswith("generator") or parents[-1].endswith("parquet")) and found_dataset_folder:
             return parents[-2]
         return None