'Ensure that you can save and find an empty embedded document.'

def test_find_empty_embedded(self):

    class User(EmbeddedDocument, ):
        name = StringField()
    class BlogPost(Document, ):
        content = StringField()
        author = EmbeddedDocumentField(User)
    BlogPost.drop_collection()
    BlogPost.objects.create(content='Anonymous    post...')
    result = BlogPost.objects.get(author=None)
    self.assertEqual(result.author, None)
