Fixed: Skip move when source and destination are the same

Co-authored-by: Qstick <qstick@gmail.com>

src/NzbDrone.Core/Books/Services/MoveAuthorService.cs

@@ -1,6 +1,7 @@
 using System.IO;
 using NLog;
 using NzbDrone.Common.Disk;
+using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Instrumentation.Extensions;
 using NzbDrone.Core.Books.Commands;
 using NzbDrone.Core.Books.Events;
@@ -55,6 +56,12 @@ private void MoveSingleAuthor(Author author, string sourcePath, string destinati
                 _logger.ProgressInfo("Moving {0} from '{1}' to '{2}'", author.Name, sourcePath, destinationPath);
             }
 
+            if (sourcePath.PathEquals(destinationPath))
+            {
+                _logger.ProgressInfo("{0} is already in the specified location '{1}'.", author, destinationPath);
+                return;
+            }
+
             try
             {
                 _rootFolderWatchingService.ReportFileSystemChangeBeginning(sourcePath, destinationPath);