fix: allow not validating SBOM

[SMillerDev]

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Should solve some error messages when people do not have this gem installed.

[SMillerDev]

It seems we need a can_validate?

[MikeMcQuaid]

Thanks for the PR. Let's just make this a boolean, like all ? suffixed methods should be. I don't think it makes sense to use nil for purity's sake when it just makes the code more complex and less idiomatic.

[MikeMcQuaid]

Thanks @SMillerDev!