how to retain empty directory just for make the tree complete

[liugt34]

Steps to reproduce

1. have 3 directories, and one directory has no file
2. zip the root directory
3. the empty directory missing

            var zipName = Path.ChangeExtension(versionPath, ".zip");
            FastZip fastZip = new FastZip();
            fastZip.UseUnicode = true;
            fastZip.StringCodec.CodePage = Encoding.GetEncoding("GB2312").CodePage;
            string filter = null;
            fastZip.CreateZip(zipName, versionPath, true, filter, filter);

Expected behavior

retain the directory even if the directory is empty

Actual behavior

the directory has missing

Version of SharpZipLib

1.4.0

Obtained from (only keep the relevant lines)

• Package installed using NuGet

[liugt34]

i find this property CreateEmptyDirectories