fix codelist operations type inference for empty dataframes#1709

gerrycampion merged 5 commits into

maincdisc-org/cdisc-rules-engine:mainfrom

1651-new-version-of-core-engine-causes-errors-in-usdm-rule-executioncdisc-org/cdisc-rules-engine:1651-new-version-of-core-engine-causes-errors-in-usdm-rule-executionCopy head branch name to clipboard