function system_entity_form_mode_presave
Implements hook_ENTITY_TYPE_presave() for form mode entities.
Sets the description property to an empty string.
@todo Remove this BC layer in drupal:11.0.0.
File
- 
              core/
modules/ system/ system.module, line 1420  
Code
function system_entity_form_mode_presave(EntityFormModeInterface $entity_form_mode) {
  if ($entity_form_mode->get('description') === NULL) {
    $entity_form_mode->set('description', '');
  }
}
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