TokenTreeTable::formatRow can set an object as a value for rendering

I've added a very simple patch, just for my needs, I hope someone will fix it or just improve the patch, tia.

Hello,

I meet the same message with "paragraphs_library_item" entity type on URL "/devel/token/paragraphs_library_item/{id}": "Exception: Object of type Drupal\paragraphs\Entity\ParagraphsType cannot be printed".

It try to generate a token "[paragraphs_library_item:paragraphs:entity:type:entity]" as EntityType object.

Your patch seems to fix my issue. It's not perfect but the page loaded correctly.

Thanks !