Merged revisions 78875 via svnmerge from

Merged revisions 78875 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r78875 | victor.stinner | 2010-03-12 18:00:41 +0100 (ven., 12 mars 2010) | 5 lines

  Issue #6697: use %U format instead of _PyUnicode_AsString(), because
  _PyUnicode_AsString() was not checked for error (NULL).

  The unicode string is no more truncated to 200 or 400 *bytes*.
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