radicale calendar error 500

[p91paul]

Modifying a task's priority from thunderbird results in an error 500, with the following traceback. Looks like not all modifications trigger the bug.

$ radicale --debug -f
Traceback (most recent call last):
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 85, in run
    self.result = application(self.environ, self.start_response)
  File "/usr/lib/python2.7/dist-packages/radicale/__init__.py", line 306, in __call__
    user)
  File "/usr/lib/python2.7/dist-packages/radicale/__init__.py", line 545, in put
    collection.set_mimetype(environ.get("CONTENT_TYPE"))
  File "/usr/lib/python2.7/dist-packages/radicale/ical.py", line 405, in set_mimetype
    props["tag"] = "VCALENDAR"
  File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
    self.gen.next()
  File "/usr/lib/python2.7/dist-packages/radicale/storage/filesystem.py", line 142, in props
    with open(self._props_path, "w") as prop_file:
  File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
    return self.gen.next()
  File "/usr/lib/python2.7/dist-packages/radicale/storage/filesystem.py", line 52, in open
    with codecs.open(abs_path, mode, config.get("encoding", "stock")) as fd:
  File "/usr/lib/python2.7/codecs.py", line 878, in open
    file = __builtin__.open(filename, mode, buffering)
IOError: [Errno 20] Not a directory: '/var/lib/radicale/collections/user/calendar.ics/ndar.ics.props'

I'm not going to report this bug upstream, since radicale v1.11 is out while on jessie we have v0.9, so I don't know if the bug is still there.