Add availability to leave empty config for events.xml#19145

magento-engcom-team merged 2 commits intomagento:2.2-developmagento/magento2:2.2-developfrom

lisovyievhenii:15775-Incorrect-return-type-getList-in-CustomerRepositorylisovyievhenii/magento2:15775-Incorrect-return-type-getList-in-CustomerRepositoryCopy head branch name to clipboard