I'm not sure it it's a problem, but, if it were my feed, I'd remove the empty objects.
I ran your feed thru my test channel as this is what came up:
No items in feed match the category tags that have been specified
7 items have error: Thumbnail must be 16x9 aspect ratio, at least 800w x 450h, and either in JPG or PNG format.
5 items have warning: Optional longDescription is empty.