requestStations fails if initialize was called without a connection

feedfm_example.swift

func initialize(_ token: String, secret: String) {
  FMAudioPlayer.setClientToken(token, secret: secret)
}

func requestStations(stationsCallback: (Stations) -> ()) {
  FMAudioPlayer.shared().whenAvailable({
    guard let stations = FMAudioPlayer.shared().getAllStations(options: [:]) else {
      // throw error
      return
    }
            
    let stationInfo = stations.map {
      ["name": $0.name,
       "identifier": $0.identifier]
    }
            
    stationsCallback(stationInfo)
  }) {
    // throw error
  }
}