title: Reading zipped folder with empty subdirectories causes problems
body: <p>I'm running into a strange problem using ZipFile and ZipArchive with .Net 4.5.</p>
  
  <p>ZipFile.CreateFromDirectory takes all content of a directory, including folders that are empty.
  If I try to create the same zip file using Windows explorer by right clicking > Send to > Compressed folder, I get a warning message saying the empty folder was omitted.</p>
  
  <p>I'm loading the resulting zip file into an application that runs on Apache Tomcat. This application throws errors for every single file contained in the zip that I produced with ZipFile.CreateFromDirectory. The zip that I created manually through Windows explorer is read just fine.</p>
  
  <p>I suspect the problem lies in the empty zipped folders, but haven't yet been able to definitively conclude this. If the empty folders are the cause, I'd need a way to use ZipFile.CreateFromDirectory excluding empty folders.</p>