v1.14.1 — codegen: valid TS for nullable objects

Fixed

• codegen no longer emits invalid TypeScript for nullable objects. A
  nullable object schema — OpenAPI 3.1 type: ["object", "null"] or 3.0
  nullable: true — renders as { … } | null, which starts with { but is
  not a bare object body. The generator mistook it for an interface body and
  produced export interface Profile { … } | null (a syntax error). Such
  schemas now emit a valid type alias (export type Profile = { … } | null);
  plain objects still emit export interface.