merge constructor of Drupal\Core\Form\ConfigFormBase into
requested to merge issue/saml_sp-3446114:3446114-Settings-page-gets-fatal-error-in-a-new-installation into 4.x
Drupal\saml_sp\Form\SamlSpConfig https://www.drupal.org/project/saml_sp/issues/3446114
Closes #3446114