It's producing invalid union types with an empty branch (| |) that falls back to any

Example input (Swagger):

dataVencimento:
  anyOf:
    - type: string
      format: date-time
    - nullable: true
      enum:
        - null

Generated output

export type ListFreguesias200ItemDataVencimento = string |  | null;

Expected output:

export type ListFreguesias200ItemDataVencimento = string | null;

Note:
The same issue happens with non–date-time strings:

terminacao:
  anyOf:
    - type: string
    - nullable: true
      enum:
        - null

Generates:

export type ListFreguesias200ItemTerminacao = string |  | null;

Instead of:

export type ListFreguesias200ItemTerminacao = string | null;

I'm using the latest version ^7.11.2