Better exception when directory not found

Author: LTRData

Library/DiscUtils.Fat/FatFileSystem.cs

@@ -1128,7 +1128,9 @@ public override IEnumerable<string> GetDirectories(string path, string searchPat
     /// <returns>Array of files.</returns>
     public override IEnumerable<string> GetFiles(string path)
     {
-        var dir = GetDirectory(path);
+        var dir = GetDirectory(path)
+            ?? throw new DirectoryNotFoundException($"The directory '{path}' was not found");
+
         var entries = dir.GetFiles();
 
         foreach (var dirEntry in entries)