[bug] `blutui.agency` returns object even if agency does not exist

[dion-blutui]

    const blutui = new Blutui(token.access_token as string);

    const agency = await blutui.agency(handle);

Random agency handle: kahjsdgfjkahsdf

<ref *1> Agency {
  blutui: <ref *2> Blutui {
    accessToken: '',
    options: {},
    _agencies: { kahjsdgfjkahsdf: [Circular *1] },
    _projects: {},
    agencies: Agencies { blutui: [Circular *2] },
    user: User { blutui: [Circular *2] },
    baseURL: 'https://api.blutui.com',
    client: Client {
      baseURL: 'https://api.blutui.com',
      options: [Object],
      _fetchFn: [AsyncFunction]
    }
  },
  username: 'kahjsdgfjkahsdf',
  brand: Brand { agency: [Circular *1] },
  cassettes: Cassettes { agency: [Circular *1] },
  domains: Domains { agency: [Circular *1] },
  invites: Invites { agency: [Circular *1] },
  members: Members { agency: [Circular *1] },
  projects: Projects { agency: [Circular *1] },
  roles: Roles { agency: [Circular *1] }
}

[jayan-blutui]

I don't think it should be the SDK's job to validate the existence of a project. If we did this validation then the SDK would need to do this validation request every time.