[patch-dark-ref] insure we must change chdir prior to do it

nxtomomill/utils.py

@@ -458,7 +458,8 @@ def _insert_frame_data(data, file_path, data_path, where, logger=None):
 
                     def recreate_vs(vs_info, vds_file):
                         with cwd_context():
-                            os.chdir(os.path.dirname(vds_file))
+                            if os.path.dirname(vds_file) not in ("", None):
+                                os.chdir(os.path.dirname(vds_file))
                             with HDF5File(vs_info.file_name, mode="r") as vs_node:
                                 vs_shape = vs_node[vs_info.dset_name].shape
                                 length = vs_shape[0]