Inline groups of "allOf" leads to unknown types

[Cy-4AH]

SwagGen/Sources/SwagGenKit/SwaggerExtensions.swift

Line 162 in 97ee617

 case .all: 

Should return here self instead of nil

Example:

    Event:
      type: object
      properties:
        location:
          allOf:
            - $ref: '#/components/schemas/AddressModel'
          nullable: true