[Backport 2.1] Fix minor issues in ui export converter classes#15693

magento-engcom-team merged 1 commit intomagento:2.1-developmagento/magento2:2.1-developfrom

dmytro-ch:fix/2.1-minor-issues-in-ui-export-convertersdmytro-ch/magento2:fix/2.1-minor-issues-in-ui-export-convertersCopy head branch name to clipboard