createrepo not creating URLs correctly

If the directory you wish to publish to contains characters that need to be escaped for a URL then create repo bombs out and will not work.

Linux ubuntu 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Ubuntu 15.04
createrepo 0.10.3-1

e.g.

user@ubuntu:~$ createrepo --update -o "/home/luser/source/a space/packaging/dist/jenkins/1.642/rpm-rc" --baseurl=file:/tmp/wibble "/home/luser/source/a space/packaging/dist/jenkins/1.642/rpm-rc/RPMS/noarch/"
Traceback (most recent call last):
  File "/usr/share/createrepo/genpkgmetadata.py", line 308, in <module>
    main(sys.argv[1:])
  File "/usr/share/createrepo/genpkgmetadata.py", line 276, in main
    mdgen.doPkgMetadata()
  File "/usr/lib/python2.7/dist-packages/createrepo/__init__.py", line 401, in doPkgMetadata
    self._setup_old_metadata_lookup()
  File "/usr/lib/python2.7/dist-packages/createrepo/__init__.py", line 387, in _setup_old_metadata_lookup
    self.oldData = readMetadata.MetadataIndex(old_repo_path, opts)
  File "/usr/lib/python2.7/dist-packages/createrepo/readMetadata.py", line 50, in __init__
    self._repo.baseurl = 'file://' + realpath
  File "/usr/lib/python2.7/dist-packages/yum/config.py", line 99, in __set__
    value, str(e)))
ValueError: Error parsing "baseurl = 'file:///home/luser/source/a space/packaging/dist/jenkins/1.642/rpm-rc'": URL must be http, ftp, file or https not ""

The code is obviously wrong...
/usr/lib/python2.7/dist-packages/createrepo/readMetadata.py:50
    self._repo.baseurl = 'file://' + realpath

You can not assume that an abitrary directory can be converted to a URL by prepending with file:// - characters need to be escaped - this is the whole reason why URL handling functions exist - e.g. https://docs.python.org/3/library/urllib.request.html#urllib.request.pathname2url