Parsing functions error fixed
Recent pandas versions have changed the way they interpret "None" in DataFrames indices and values, which are currently interpreted it as NaN. This mario update fixes the issue by replacing NaN with the string "None" when parsing excel files.
Deprecated functions
Parser for old-fashioned Eurostat SUTs is deprecated. This function relied on peculiarly structured SUTs formats. In case you need to parse such SUTs, please rearrange them into the standard MARIO format. You can check the MARIO format from 'SUT.xlsx' file in the mario/test directory in this repository.