Refactor RootFileReader.retrieve_object #191
Description
The current code is hard to understand and I am not even sure that it works as intended: https://github.com/HEPData/hepdata_lib/blob/master/hepdata_lib/root_utils.py#L51-L118
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The current code is hard to understand and I am not even sure that it works as intended: https://github.com/HEPData/hepdata_lib/blob/master/hepdata_lib/root_utils.py#L51-L118