[GSK-4133] Fix RAGReport save and load methods for when KB is not set#2100

kevinmessiaen merged 3 commits intomainGiskard-AI/giskard-oss:mainfrom

feature/gsk-4133-giskardragreportsave-fails-if-evaluate-doesnt-includeGiskard-AI/giskard-oss:feature/gsk-4133-giskardragreportsave-fails-if-evaluate-doesnt-includeCopy head branch name to clipboard