Hi everyone! New icepyx user here 
I am trying to open a single ATL8 file (manually from the Earthdata portal), and everything goes fine up to a weird crash (a full gist is here):
filepath = './ATL08_20200614005307_12140704_005_01.h5'
reader = ipx.Read(filepath, "ATL08")
reader.vars.append(beam_list=['gt1l','gt1r','gt2l','gt2r','gt3l','gt3r'], var_list=["h_canopy", "latitude", "longitude"])
ds = reader.load()
ds
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
Input In [7], in <cell line: 1>()
----> 1 ds = reader.load()
2 ds
File ~/miniconda3/envs/cpu-pangeo/lib/python3.8/site-packages/icepyx/core/read.py:443, in Read.load(self)
436 # DevNote: I'd originally hoped to rely on intake-xarray in order to not have to iterate through the files myself,
437 # by providing a generalized url/source in building the catalog.
438 # However, this led to errors when I tried to combine two identical datasets because the single dimension was equal.
439 # In these situations, xarray recommends manually controlling the merge/concat process yourself.
440 # While unlikely to be a broad issue, I've heard of multiple matching timestamps causing issues for combining multiple IS2 datasets.
441 for file in self._filelist:
442 all_dss.append(
--> 443 self._build_single_file_dataset(file, groups_list)
444 ) # wanted_groups, vgrp.keys()))
446 if len(all_dss) == 1:
447 return all_dss[0]
File ~/miniconda3/envs/cpu-pangeo/lib/python3.8/site-packages/icepyx/core/read.py:577, in Read._build_single_file_dataset(self, file, groups_list)
575 for grp_path in ["orbit_info"] + list(wanted_groups_set):
576 ds = self._read_single_var(file, grp_path)
--> 577 is2ds = Read._add_var_to_ds(
578 is2ds, ds, grp_path, wanted_groups_tiered, wanted_dict
579 )
581 return is2ds
File ~/miniconda3/envs/cpu-pangeo/lib/python3.8/site-packages/icepyx/core/read.py:342, in Read._add_var_to_ds(is2ds, ds, grp_path, wanted_groups_tiered, wanted_dict)
339 wanted_vars = list(wanted_dict.keys())
341 if grp_path in ["orbit_info", "ancillary_data"]:
--> 342 grp_spec_vars = [
343 wanted_vars[i]
344 for i, x in enumerate(wanted_groups_tiered[0])
345 if x == grp_path
346 ]
348 for var in grp_spec_vars:
349 is2ds = is2ds.assign({var: ("gran_idx", ds[var].data)})
File ~/miniconda3/envs/cpu-pangeo/lib/python3.8/site-packages/icepyx/core/read.py:343, in <listcomp>(.0)
339 wanted_vars = list(wanted_dict.keys())
341 if grp_path in ["orbit_info", "ancillary_data"]:
342 grp_spec_vars = [
--> 343 wanted_vars[i]
344 for i, x in enumerate(wanted_groups_tiered[0])
345 if x == grp_path
346 ]
348 for var in grp_spec_vars:
349 is2ds = is2ds.assign({var: ("gran_idx", ds[var].data)})
IndexError: list index out of range
Any suggestions on what may be going on?