Adding 'Rendered entity' to a view region when the entity does not have a UUID fails with exception due to config dependency target bug

Problem/Motivation

I'm unable to add an "Aggregator feed item" area to the footer of a view. The settings of the area handler don't appear.

The following error appears in watchdog:
Drupal\Core\Entity\EntityStorageException: Entity type aggregator_item does not support UUIDs. in Drupal\Core\Entity\EntityManager->loadEntityByUuid() (line 1132 of /home/dfg64/www/core/lib/Drupal/Core/Entity/EntityManager.php).

Steps to reproduce:

1. Standard Drupal 8 install
2. Enabled Aggregator Module
3. Edit "Content" view (or any other): admin/structure/views/view/content
4. Click "Add" on Header or Footer in view configuration
5. Select "Global: Rendered entity - Aggregator feed item" and "Apply"
6. Note Configuration for Aggregator feed item is not presented, Above error should appear in logs
7. Closing the "Add" Dialog and clicking "Save" on view will also produce this error.

Proposed resolution

Fix it. Write tests.

Remaining tasks

Fix it. Write tests.