Maintain file structure when using ADLUploader even if directory is empty

[masangster]

Description

Similar to the previous issue with the downloader, the uploader does not replicate the file structure on the remote path if the directory tree does not contain any file but only folders. This is needed to give predictable behaviour regarding whether a folder should already exist or not.

Environment summary

SDK Version: What version of the SDK are you using? (pip show azure-datalake-store)
Answer here: 0.0.27

Python Version: What Python version are you using? Is it 64-bit or 32-bit?
Answer here: 3.6 64 bit

OS Version: What OS and version are you using?
Answer here: Windows 7 and 10

Shell Type: What shell are you using? (e.g. bash, cmd.exe, Bash on Windows)
Answer here: VS code

[akharit]

Fixed.