Omit package entries that denote the directory.

ICSharpCode.ILSpyX/LoadedPackage.cs

@@ -71,8 +71,11 @@ namespace ICSharpCode.ILSpyX
 			foreach (var entry in this.Entries)
 			{
 				var (dirname, filename) = SplitName(entry.Name);
+				if (!string.IsNullOrEmpty(filename))
+				{
 					GetFolder(dirname).Entries.Add(new FolderEntry(filename, entry));
 				}
+			}
 			this.RootFolder = rootFolder;
 
 			static (string, string) SplitName(string filename)