Adding la_eu_default_content to install profile results in error

Problem/Motivation

Adding la_eu_default_content to install profile results in error

Error: Call to a member function get() on null in Drupal\site_settings\Entity\SiteSettingEntity::getDefaultFieldset()

Steps to reproduce

* Add la_eu_default_content to install profile
* Install

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes