invenio-cli check-requirements --development fails on non-RDM site

Package version (if known): 1.0.17

## Describe the bug

invenio-cli in version 1.0.17 started checking for RDM version - see https://github.com/inveniosoftware/invenio-cli/blob/master/invenio_cli/commands/requirements.py#L195

The problem is that if Invenio-cli is used on site without invenio-app-rdm installed, this check fails with a key error:

```
Traceback (most recent call last):
File "/private/tmp/blah/.venv/invenio-cli/bin/invenio-cli", line 8, in
sys.exit(invenio_cli())
File "/private/tmp/blah/.venv/invenio-cli/lib/python3.9/site-packages/click/core.py", line 1130, in __call__
return self.main(*args, **kwargs)
File "/private/tmp/blah/.venv/invenio-cli/lib/python3.9/site-packages/click/core.py", line 1055, in main
rv = self.invoke(ctx)
File "/private/tmp/blah/.venv/invenio-cli/lib/python3.9/site-packages/click/core.py", line 1657, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/private/tmp/blah/.venv/invenio-cli/lib/python3.9/site-packages/click/core.py", line 1404, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/private/tmp/blah/.venv/invenio-cli/lib/python3.9/site-packages/click/core.py", line 760, in invoke
return __callback(*args, **kwargs)
File "/private/tmp/blah/.venv/invenio-cli/lib/python3.9/site-packages/invenio_cli/cli/cli.py", line 62, in check_requirements
steps = RequirementsCommands.check(development)
File "/private/tmp/blah/.venv/invenio-cli/lib/python3.9/site-packages/invenio_cli/commands/requirements.py", line 254, in check
steps.extend(cls.check_dev())
File "/private/tmp/blah/.venv/invenio-cli/lib/python3.9/site-packages/invenio_cli/commands/requirements.py", line 195, in check_dev
if rdm_version()[0] >= 11:
File "/private/tmp/blah/.venv/invenio-cli/lib/python3.9/site-packages/invenio_cli/helpers/rdm.py", line 21, in rdm_version
r"[0-9]*\.[0-9]*\.[0-9]*", parsed.data["default"]["invenio-app-rdm"]["version"]
KeyError: 'invenio-app-rdm'
```

There is currently no workaround for this.

## Steps to Reproduce
1. Install invenio with invenio-cli
2. Remove invenio-app-rdm from the pipfile
3. Run check-requirements

## Expected behavior

The check is supposed to pass, ideally allowing to use node 16