Arch Linux

Description:

Python software that relies on `python-jsonpickle` fails if `python-importlib-metadata` is not installed

Steps to reproduce:

1. Install `certbot` and `certbot-dns-digitalocean`
2. Run `certbot`

The result is

```
An unexpected error occurred:
pkg_resources.DistributionNotFound: The 'importlib_metadata' distribution was not found and is required by jsonpickle
Please see the logfile '/tmp/tmpv5anntws/log' for more details.
```

Logfile:

```
2020-06-28 10:51:42,293:DEBUG:certbot._internal.log:Exiting abnormally:
Traceback (most recent call last):
File "/usr/bin/certbot", line 11, in <module>
load_entry_point('certbot==1.5.0', 'console_scripts', 'certbot')()
File "/usr/lib/python3.8/site-packages/certbot/main.py", line 15, in main
return internal_main.main(cli_args)
File "/usr/lib/python3.8/site-packages/certbot/_internal/main.py", line 1317, in main
plugins = plugins_disco.PluginsRegistry.find_all()
File "/usr/lib/python3.8/site-packages/certbot/_internal/plugins/disco.py", line 207, in find_all
plugin_ep = PluginEntryPoint(entry_point)
File "/usr/lib/python3.8/site-packages/certbot/_internal/plugins/disco.py", line 54, in __init__
self.plugin_cls = entry_point.load()
File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 2460, in load
self.require(*args, **kwargs)
File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 2483, in require
items = working_set.resolve(reqs, env, installer, extras=self.extras)
File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 786, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'importlib_metadata' distribution was not found and is required by jsonpickle
2020-06-28 10:51:42,293:ERROR:certbot._internal.log:An unexpected error occurred:
2020-06-28 10:51:42,293:ERROR:certbot._internal.log:pkg_resources.DistributionNotFound: The 'importlib_metadata' distribution was not found and is required by jsonpickle
```

Installing `python-importlib-metadata` solves the problem.