Having issues getting isotherms into pygaps, aif import fails

[a11enh]

Describe the bug
Done in jupyter lab: using import_from_aif from a converted to .aif format (from quantachrome via the online web-aif converter) - fails on import due to string parsing?

To Reproduce

import pygaps.parsing as pgp
isotherm = pgp.isotherm_from_aif('MySample1.aif')

Errors reported:

FutureWarning: errors='ignore' is deprecated and will raise in a future version. Use to_numeric without passing `errors` and catch exceptions explicitly instead
  ).apply(pandas.to_numeric, errors='ignore')
---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
Cell In[4], line 3
      1 import pygaps.parsing as pgp
----> 3 isotherm = pgp.isotherm_from_aif('MySample1.aif')

File [~\AppData\Local\anaconda3\Lib\site-packages\pygaps\parsing\aif.py:350](http://localhost:8888/lab/tree/Desktop/~/AppData/Local/anaconda3/Lib/site-packages/pygaps/parsing/aif.py#line=349), in isotherm_from_aif(str_or_path, **isotherm_parameters)
    348 # loading/material units
    349 loading_material_units = block.find_value('_units_loading').strip("'")
--> 350 loading_material_dict = parse_loading_string(loading_material_units)
    351 raw_dict.update(loading_material_dict)
    353 # temperature units

File [~\AppData\Local\anaconda3\Lib\site-packages\adsorption_file_parser\utils\unit_parsing.py:199](http://localhost:8888/lab/tree/Desktop/~/AppData/Local/anaconda3/Lib/site-packages/adsorption_file_parser/utils/unit_parsing.py#line=198), in parse_loading_string(loading_string, missing_units)
    197 if len(unit_components) != 2:
    198     unit_components = loading_string_clean.split(' ')
--> 199     unit_components[1] = unit_components[1].replace('-1', '')
    200 if len(unit_components) != 2:
    201     raise ParsingError(error_text)

IndexError: list index out of range

Expected behavior
pygaps importer would have imported loading units appropriately... from the .aif the header info is:

data_raw2aif _exptl_operator 'User1' _exptl_date 2024-08-23T00:00:00 _exptl_instrument 'Autosorb iQ Station 2' _exptl_adsorptive 'Nitrogen' _exptl_temperature 77.35 _adsnt_sample_mass 0.0717 _adsnt_sample_id 'sample1' _adsnt_material_id 'unknown' _units_temperature 'K' _units_pressure 'Torr' _units_mass 'g' _units_loading 'cc' _audit_aif_version d546195

System (please complete the following information):

• Windows 11, Anaconda
• Python 3.11.9 64-bit
• Conda 24.7.1

Additional context
Had issues manually creating point-isotherms from data, but further work I think will make it work... coming at this from a few different directions... trying to compare multiple machines (Nova, Quantachrome, Micromeritics)

Where you are from?/How are you using pyGAPS? (optional)
Researcher at Univ. Of IL working on graphene-like carbons