Merged revisions 78137 via svnmerge from

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  r78137 | r.david.murray | 2010-02-10 17:42:04 -0500 (Wed, 10 Feb 2010) | 8 lines

  Issue 7835:  Shelve's __del__ method calls its close method, and its
  close method refers to an identifier in the global module namespace.
  This means that when __del__ is called during interpreter shutdown (if,
  for example, the calling program still has a pointer to the shelf),
  sometimes that global identifier would wind up being None, causing
  mysterious 'ignored' exceptions.  This patch checks for the possible None
  value first before using the global, thus avoiding the error messages.
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