MusicSharp Crashes when Saving a Playlist (V2 Branch)

[markjamesm]

When saving a playlist, the player crashes with an error. Despite this, an .M3U file is created with the saved songs and can be loaded and used upon MusicSharp's relaunch.

[markjamesm]

• The method to save a playlist can be found in Playlist.cs.
• The SavePlaylist() method in Tui.cs handles the UI controls.