message: Lowered minItems to 0 to match API implementation
diff: "items": {
  "$ref": "#/definitions/BudgetFilterProperties"
  },
  - "minItems": 2
  + "minItems": 0
  },
  "not": {
  "description": "The logical \"NOT\" expression.",
  "items": {
  "type": "string"
  },
  - "minItems": 1
  + "minItems": 0
  }
  },
  "required": [
  