Arch Linux

Description:
If the missing dependency, jupyterlab_pygments, is not installed launching `jupyter lab` gives the following error:

Traceback (most recent call last):
File "/usr/bin/jupyter-lab", line 33, in <module>
sys.exit(load_entry_point('jupyterlab==3.0.0', 'console_scripts', 'jupyter-lab')())
File "/usr/bin/jupyter-lab", line 25, in importlib_load_entry_point
return next(matches).load()
File "/usr/lib/python3.9/importlib/metadata.py", line 77, in load
module = import_module(match.group('module'))
File "/usr/lib/python3.9/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
File "<frozen importlib._bootstrap>", line 972, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 790, in exec_module
File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
File "/usr/lib/python3.9/site-packages/jupyterlab/__init__.py", line 7, in <module>
from .labapp import LabApp
File "/usr/lib/python3.9/site-packages/jupyterlab/labapp.py", line 16, in <module>
from jupyterlab_server import slugify, WORKSPACE_EXTENSION
File "/usr/lib/python3.9/site-packages/jupyterlab_server/__init__.py", line 4, in <module>
from .app import LabServerApp
File "/usr/lib/python3.9/site-packages/jupyterlab_server/app.py", line 16, in <module>
from .handlers import add_handlers, LabConfig
File "/usr/lib/python3.9/site-packages/jupyterlab_server/handlers.py", line 24, in <module>
from .translations_handler import TranslationsHandler
File "/usr/lib/python3.9/site-packages/jupyterlab_server/translations_handler.py", line 16, in <module>
from .translation_utils import get_language_pack, get_language_packs, is_valid_locale
File "/usr/lib/python3.9/site-packages/jupyterlab_server/translation_utils.py", line 13, in <module>
import pkg_resources
File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3239, in <module>
def _initialize_master_working_set():
File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3222, in _call_aside
f(*args, **kwargs)
File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3251, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 567, in _build_master
ws.require(__requires__)
File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 884, in require
needed = self.resolve(parse_requirements(requirements))
File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 770, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'jupyterlab_pygments' distribution was not found and is required by nbconvert


Additional info:
* package version(s)
community/jupyterlab 3.0.0-2
community/jupyterlab_pygments 0.1.2-2
* config and/or log files etc.
* link to upstream bug report, if any

Steps to reproduce:
type `jupyter lab` into command line

PS: I cound not find community packages as described in the [wiki](https://wiki.archlinux.org/index.php/Reporting_Bug_Guidelines) so this is submitted to Packages:Extra. Feel free to direct this to appropriate place