Handle non-existent URL's

[juanpablofernandez]

Is your feature request related to a problem? Please describe.
Devs should definetly check that the URL provided when creating an AudioItem is valid and can be played. But there remains a case where the url can be broken later on, or it was never available. When this happens in a QueuedAudioPlayer it stops playing, I think a better solution is to skip to the next AudioItem in the queue.

Describe the solution or feature you would like
I've been playing around with a solution for this, and came up with the following code. I placed it inside the handleAudioPlayerPlaybackEnd handler, but I'm not sure if that's the right approach.

        if let currentItem = audioManager.player.currentItem {
            let currentPath = URL(string: currentItem.getSourceUrl())!.path()
            let doesNotExist = !FileManager.default.fileExists(atPath: currentPath)
            if doesNotExist {
                print("File DOES NOT EXIST")
                switch data {
                case .failed:
                    let newIndex = audioManager.player.currentIndex + 1
                    try? audioManager.player.jumpToItem(atIndex: newIndex)
                case .skippedToPrevious:
                    let newIndex = audioManager.player.currentIndex - 1
                    try? audioManager.player.jumpToItem(atIndex: newIndex)
                default: break
                }
            }
        }

Describe alternatives you've considered
I have not thought of any alternatives, but any feedback on this is welcomed.