hvplot: sample_data try/except import wrapper fails

ALL software version info

hvplot: 0.7.3

Description of expected behavior and the observed behavior

The following import fails, despite the all-catching except in the code?? (Honestly stumped)

from hvplot.sample_data import us_crime, airline_flights

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
/tmp/ipykernel_3185062/1788543639.py in <module>
----> 1 from hvplot.sample_data import us_crime, airline_flights

~/miniconda3/envs/py39/lib/python3.9/site-packages/hvplot/sample_data.py in <module>
     23 # Add catalogue entries to namespace
     24 for _c in catalogue:
---> 25     globals()[_c] = catalogue[_c]

~/miniconda3/envs/py39/lib/python3.9/site-packages/intake/catalog/base.py in __getitem__(self, key)
    398             if e.container == 'catalog':
    399                 return e(name=key)
--> 400             return e()
    401         if isinstance(key, str) and '.' in key:
    402             key = key.split('.')

~/miniconda3/envs/py39/lib/python3.9/site-packages/intake/catalog/entry.py in __call__(self, persist, **kwargs)
     75             raise ValueError('Persist value (%s) not understood' % persist)
     76         persist = persist or self._pmode
---> 77         s = self.get(**kwargs)
     78         if persist != 'never' and isinstance(s, PersistMixin) and s.has_been_persisted:
     79             from ..container.persist import store

~/miniconda3/envs/py39/lib/python3.9/site-packages/intake/catalog/local.py in get(self, **user_parameters)
    287             return self._default_source
    288 
--> 289         plugin, open_args = self._create_open_args(user_parameters)
    290         data_source = plugin(**open_args)
    291         data_source.catalog_object = self._catalog

~/miniconda3/envs/py39/lib/python3.9/site-packages/intake/catalog/local.py in _create_open_args(self, user_parameters)
    261 
    262         if len(self._plugin) == 0:
--> 263             raise ValueError('No plugins loaded for this entry: %s\n'
    264                              'A listing of installable plugins can be found '
    265                              'at https://intake.readthedocs.io/en/latest/plugin'

ValueError: No plugins loaded for this entry: parquet
A listing of installable plugins can be found at https://intake.readthedocs.io/en/latest/plugin-directory.html .

For reference, this is the code in 0.7.3:

import os

try:
    from intake import open_catalog
except:
    raise ImportError('Loading hvPlot sample data requires intake '
                      'and intake-parquet. Install it using conda or '
                      'pip before loading data.')

How can intake throw a ValueError??

Complete, minimal, self-contained example code that reproduces the issue

• Have only the package intake installed, no other intake-subpackages.
• Execute : from hvplot.sample_data import us_crime, airline_flights

# code goes here between backticks
from hvplot.sample_data import us_crime, airline_flights

Stack traceback and/or browser JavaScript console output

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
/tmp/ipykernel_3185062/1788543639.py in <module>
----> 1 from hvplot.sample_data import us_crime, airline_flights

~/miniconda3/envs/py39/lib/python3.9/site-packages/hvplot/sample_data.py in <module>
     23 # Add catalogue entries to namespace
     24 for _c in catalogue:
---> 25     globals()[_c] = catalogue[_c]

~/miniconda3/envs/py39/lib/python3.9/site-packages/intake/catalog/base.py in __getitem__(self, key)
    398             if e.container == 'catalog':
    399                 return e(name=key)
--> 400             return e()
    401         if isinstance(key, str) and '.' in key:
    402             key = key.split('.')

~/miniconda3/envs/py39/lib/python3.9/site-packages/intake/catalog/entry.py in __call__(self, persist, **kwargs)
     75             raise ValueError('Persist value (%s) not understood' % persist)
     76         persist = persist or self._pmode
---> 77         s = self.get(**kwargs)
     78         if persist != 'never' and isinstance(s, PersistMixin) and s.has_been_persisted:
     79             from ..container.persist import store

~/miniconda3/envs/py39/lib/python3.9/site-packages/intake/catalog/local.py in get(self, **user_parameters)
    287             return self._default_source
    288 
--> 289         plugin, open_args = self._create_open_args(user_parameters)
    290         data_source = plugin(**open_args)
    291         data_source.catalog_object = self._catalog

~/miniconda3/envs/py39/lib/python3.9/site-packages/intake/catalog/local.py in _create_open_args(self, user_parameters)
    261 
    262         if len(self._plugin) == 0:
--> 263             raise ValueError('No plugins loaded for this entry: %s\n'
    264                              'A listing of installable plugins can be found '
    265                              'at https://intake.readthedocs.io/en/latest/plugin'

ValueError: No plugins loaded for this entry: parquet
A listing of installable plugins can be found at https://intake.readthedocs.io/en/latest/plugin-directory.html .

Additional info

The list of required package is now this:

• intake-parquet
• intake-xarray
• s3fs