Invalid return value in RemotePathIterator when batch_size=1 or a directory only contains a single file

[asgersvenning]

When trying to iterate over a directory with a single file (which matches pattern, i.e. RemotePathIterator.remote_paths has length 1) or batch_size = 1, the IOHandler.download branch for downloading a single file is triggered, which returns "/" as the local path, instead of the path to the file.

[asgersvenning]

A quick-fix is just to disable the single-download branch in IOHandler.download, but the correct solution is to review why this happens. I think the error ultimately originates from line 584:

     local_result = self.pget(remote_path, local_destination, blocking, **kwargs)

If the return value of IOHandler.pget in this case for some reason is "/" then this would explain the issue. This would of course suggest that the true error is in IOHandler.pget.