1658: Improve null safety and refactor UI interaction handling.#2500

VitaliyBoyko merged 4 commits intomagento:5.4.0-developmagento/magento2-phpstorm-plugin:5.4.0-developfrom

vitaliyboykocontributor:1658-Cannot-invoke-com.intellij.psi.PsiDirectory.getName()-vitaliyboykocontributor/magento2-phpstorm-plugin:1658-Cannot-invoke-com.intellij.psi.PsiDirectory.getName()-Copy head branch name to clipboard