What is your rclone version (eg output from rclone -V)
v1.38-117-g409ba56fβ

Which OS you are using and how many bits (eg Windows 7, 64 bit)
MacOs 10.13

Which cloud storage system are you using? (eg Google Drive)
OneDrive Personal

The command you were trying to run (eg rclone copy /tmp remote:tmp)
rclone -vv sync Sviluppo/Android\ Studio\ Projects/AnimalidellaFattoria onedrive:'Backup/Progetti Android/AnimalidellaFattoria'

A log from the command with the -vv flag (eg output from rclone -vv copy /tmp remote:tmp)
log.txt

Using stable and beta version (as suggested as reply to my post on forum) gives same result: no empty folders are created on the remote server.