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Saving the image for the first newly created post fails

If I set up a new instance and try to submit a first post, an error occurs the first time (simply re-uploading the form using F5 makes it work - and continuing to work).

The corresponding stack trace (gotten by removing the try...except block in post is:

ERROR    2012-07-21 12:04:50,745 _webapp25.py:464] Counter instance has no attribute '_Counter__key'
Traceback (most recent call last):
  File "/home/moschlar/src/google_appengine/google/appengine/ext/webapp/_webapp25.py", line 703, in __call__
    handler.post(*groups)
  File "/home/moschlar/workspace/kumo/kumo.py", line 554, in post
    post.postid = Counter('Post_ID').inc()
  File "/home/moschlar/workspace/kumo/kumo.py", line 1317, in inc
    db.run_in_transaction(self.__inc1__)
  File "/home/moschlar/src/google_appengine/google/appengine/api/datastore.py", line 2433, in RunInTransaction
    return RunInTransactionOptions(None, function, *args, **kwargs)
  File "/home/moschlar/src/google_appengine/google/appengine/api/datastore.py", line 2571, in RunInTransactionOptions
    ok, result = _DoOneTry(new_connection, function, args, kwargs)
  File "/home/moschlar/src/google_appengine/google/appengine/api/datastore.py", line 2593, in _DoOneTry
    result = function(*args, **kwargs)
  File "/home/moschlar/workspace/kumo/kumo.py", line 1328, in __inc1__
    obj = db.get(self.__key)
AttributeError: Counter instance has no attribute '_Counter__key'

Maybe someone knows why this happens in this rare case, but it's not a severe problem.