[2.0] UNIQUE horses can be created when one already exists.

[Nevakanezah]

The "secret horses" available in HE are custom-modified horses meant to be a complete rarity on servers, which is why their gender is UNIQUE - they cannot breed, and only one horse with the UNIQUE gender should exist at any time.

The expected behaviour is:

1. A horse breeding event that fulfills secret horse conditions occurs.
2. The code checks whether a horse with the UNIQUE gender already exists in the database.
3. If none exist, summon the secret horse.
4. If one does exist, the secret horse code does not run, and a normal horse is bred instead.
   

[Nevakanezah]

Confirmed fix