Merged revisions 75066 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r75066 | andrew.kuchling | 2009-09-25 17:23:54 -0500 (Fri, 25 Sep 2009) | 4 lines

  #6243: fix segfault when keyname() returns a NULL pointer.

  Bug noted by Trundle, patched by Trundle and Jerry Chen.
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