more yak shaving
```
$ glasgow run selftest leds
Traceback (most recent call last):
  File "/usr/home/emaste/.local/pipx/venvs/glasgow/lib/python3.9/site-packages/importlib_metadata/__init__.py", line 292, in __getitem__
    return next(iter(self.select(name=name)))
StopIteration
During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/home/emaste/.local/bin/glasgow", line 8, in <module>
    sys.exit(main())
  File "/usr/home/emaste/src/glasgow/software/glasgow/cli.py", line 901, in main
    exit(loop.run_until_complete(_main()))
  File "/usr/local/lib/python3.9/asyncio/base_events.py", line 647, in run_until_complete
    return future.result()
  File "/usr/home/emaste/src/glasgow/software/glasgow/cli.py", line 540, in _main
    target, applet = _applet(device.revision, args)
  File "/usr/home/emaste/src/glasgow/software/glasgow/cli.py", line 392, in _applet
    applet = GlasgowAppletMetadata.get(args.applet).applet_cls()
  File "/usr/home/emaste/src/glasgow/software/glasgow/support/plugin.py", line 70, in get
    return cls(importlib_metadata.entry_points(group=cls.GROUP_NAME, name=handle)[0])
  File "/usr/home/emaste/.local/pipx/venvs/glasgow/lib/python3.9/site-packages/importlib_metadata/__init__.py", line 294, in __getitem__
    raise KeyError(name)
KeyError: 0
```