TierDrop

Resolved a crash caused by a null UUID For easier testing, I've added a "Test Category"(applied to all equipments) to the tierdrop_config.json.

"TierEquipment": {
  "Test": [
    {
      "prefix": "Test",
      "color": "YELLOW",
      "chance": [100, 100, 100],
      "attributes": [
        { "All": ["ARMOR", 1, 1.5] },
        { "All": ["MAX_HEALTH", 2, 4] }
      ]
    }
  ],
  "Armor": [
    {