The horse disappears when you put armor on it.

Put the summary of the bug you're having here

What I expected to happen was...:
I expected to put diamond horse armor  on the horse to see if its textured had changed.

What actually happened was...:
When I put the horse armor on the horse, the horse disappeared.

Steps to Reproduce:
1. Spawn a horse and tame it
2. Grab horse armor and put it on the horse