Netcdf-reader can't read https-address directly

[bjorkqvi]

The PointNetcdf-reader can't read an OPeNDAP link:

import dnora as dn
model = dn.modelrun.ModelRun(year=2022, month=11, day=1)
model.import_spectra(filename='https://thredds.met.no/thredds/dodsC/norac_wave/spec/ww3_spec.202211.nc', convention='ww3')

Area: lon: (0.0, 0.0), lat: (0.0, 0.0)
2022-11-01 00:00:00 - 2022-11-01 23:00:00

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Trivial (PointPicker): Choosing points to import...
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Traceback (most recent call last):
  File "/home/janvb/Documents/pycode/dnora_v2_checks/plot_ww3_spectra_from_file.py", line 3, in <module>
    model.import_spectra(filename='https://thredds.met.no/thredds/dodsC/norac_wave/spec/ww3_spec.202211.nc', convention='ww3')
  File "/home/janvb/miniforge3/envs/dnora/lib/python3.10/site-packages/dnora/cacher/cache_decorator.py", line 58, in wrapper
    import_method(**kwargs)
  File "/home/janvb/miniforge3/envs/dnora/lib/python3.10/site-packages/dnora/modelrun/modelrun.py", line 475, in import_spectra
    self._import_data(
  File "/home/janvb/miniforge3/envs/dnora/lib/python3.10/site-packages/dnora/modelrun/modelrun.py", line 351, in _import_data
    obj = import_data(
  File "/home/janvb/miniforge3/envs/dnora/lib/python3.10/site-packages/dnora/modelrun/import_functions.py", line 49, in import_data
    inds = pick_points(
  File "/home/janvb/miniforge3/envs/dnora/lib/python3.10/site-packages/dnora/modelrun/import_functions.py", line 180, in pick_points
    available_points = reader.get_coordinates(
  File "/home/janvb/miniforge3/envs/dnora/lib/python3.10/site-packages/dnora/read/generic/generic_readers.py", line 93, in get_coordinates
    ds = xr.open_dataset(filepath[0])
IndexError: list index out of range

Expected outcome:

The readers reads all points from the file behind the OPeNDAP link