- Using ``model_url`` or ``model_path`` against a broken model graph

  (one with models that had a non-root model with a ``__name__`` of
  ``None``) caused an inscrutable error to be thrown: ( if not
  ``_must_quote[cachekey].search(s): TypeError: expected string or
  buffer``).  Now URLs and paths generated against graphs that have
  None names in intermediate nodes will replace the None with the
  empty string, and, as a result, the error won't be raised.  Of
  course the URL or path will still be bogus.
 

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