Duplicity with OneDrive Backend and double / at the end

Hello, I sent first this report to Michael Stapelberg who told me to report it here.

I'm using your OneDrive Backend for Duplicity.
I encounter a little bug when the path given to save finish with a / or a double //.
The recursive search is splitting the directory using /. Meaning if you have a directory given as : 'Backup//' it give an array with Backup and an empty string.

I added a failsafe to my local installation of duplicity in the method : resolve_directory line 171:

for component in self.directory.split('/'):
    if not component:
        continue

It's a small fix, but resolve my issue (since I couldn't find exactly where that double / was put in my shell script).