fix table compute validator
fix table compute validator

see tests 20 and 21 which were failing in CI

gregvonkuster/tools-iuc,galaxyproject/tools-iuc,gregvonkuster/tools-iuc,gregvonkuster/tools-iuc,galaxyproject/tools-iuc,galaxyproject/tools-iuc,galaxyproject/tools-iuc,galaxyproject/tools-iuc,gregvonkuster/tools-iuc,pavanvidem/tools-iuc,galaxyproject/tools-iuc,pavanvidem/tools-iuc,gregvonkuster/tools-iuc,pavanvidem/tools-iuc,pavanvidem/tools-iuc,gregvonkuster/tools-iuc,gregvonkuster/tools-iuc,pavanvidem/tools-iuc,pavanvidem/tools-iuc,pavanvidem/tools-iuc,galaxyproject/tools-iuc