Fixed: Moving artist folders in subfolders of the root folder when destination subfolder was missing

Co-Authored-By: Mark McDowall <markus101@users.noreply.github.com>

src/NzbDrone.Core/Music/Services/MoveArtistService.cs

@@ -61,6 +61,9 @@ namespace NzbDrone.Core.Music
                 {
                     _rootFolderWatchingService.ReportFileSystemChangeBeginning(sourcePath, destinationPath);
 
+                    // Ensure the parent of the artist folder exists, this will often just be the root folder, but
+                    // in cases where people are using subfolders for first letter (etc) it may not yet exist.
+                    _diskProvider.CreateFolder(new DirectoryInfo(destinationPath).Parent.FullName);
                     _diskTransferService.TransferFolder(sourcePath, destinationPath, TransferMode.Move);
 
                     _logger.ProgressInfo("{0} moved successfully to {1}", artist.Name, artist.Path);