fix(evaluators): raise ValueError on empty input instead of ZeroDivisionError

[mturac]

fixes #12543

DocumentMAPEvaluator, DocumentMRREvaluator, DocumentRecallEvaluator, and AnswerExactMatchEvaluator crash with ZeroDivisionError when called with empty input lists. DocumentNDCGEvaluator allready handles this correctly with early ValueError.

added same guard to all four evaluators for consistancy — early ValueError in run() when either input list is empty.

added 3 tests per evaluator (12 total) to verify ValueError on empty input. existing evaluator tests still pass.

[vercel]

@mturac is attempting to deploy a commit to the deepset Team on Vercel.

A member of the Team first needs to authorize it.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[HaystackBot]

Hi @mturac, thanks a lot for your contribution! 🙏

We noticed that the Contributor License Agreement (CLA) check (license/cla) hasn't passed yet, so we've temporarily moved this PR to draft and paused the review assignment.

To get your PR reviewed, please sign the CLA via the link in the license/cla check below (or in the CLA bot comment). As soon as the check turns green, this PR will automatically be marked ready for review again and a reviewer will be re-assigned.