[API-677] Return correct error in ConfigQuery

[professor-l]

Checklist

=========

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have checked for similar issues and haven't found anything relevant.
• This is not a security issue (which should be reported here: https://circleci.com/security/)
• I have read Contribution Guidelines.

Internal Checklist

• I am requesting a review from my own team as well as the owning team
• I have a plan in place for the monitoring of the changes that I am making (this can include new monitors, logs to be aware of, etc...)

Changes

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• Log originalErr when originalErr is non-nil

Rationale

=========

Attempting to validate a config while passing an invalid token fails with the following error:

$ circleci --token "invalid-token" config validate .circleci/config.yml -v
...
Error: config compilation request returned an error: %!w(<nil>)

The behavior would previously check if an error existed, but return a different one. After fixing that, the error prints correctly:

Error: config compilation request returned an error: invalid character 'I' looking for beginning of value

It's worth noting that the PR template explicitly instructs branching off of main, so if this should be rebased to develop instead then the template may also need updating.

[nbialostosky]

Approving commit e255781 as it should address the error we were seeing before. We tested this locally too on a call.

[JulesFaucherre]

Thanks for fixing that!