Picocli: injecting ParseResult might result in error during injection

[xtaixe]

Hi.

If there is an error parsing the args, injecting ParseResult will result in error during injection. Is there actually anything that can be done about errors during injection?

Happy to raise an issue and maybe contributing, but I wanted to discuss first because I'm not sure this will be considered a bug (although I think this feature can't be used like this) or if there are any good solutions. Some options are:

1. Parsing in lenient mode, but AFAIK that means either mutating the CommandLine or creating a new one (not sure how expensive that is or will depend on users customizations)
2. Providing a new result class that encapsulates the ParseResult and any errors thrown.
3. Providing an Optional<ParseResult> (but using an Optional seems weird).

Thoughts?