contained an implicit namespace package; for example if the ``setup()``
listed a namespace package ``foo.bar`` without explicitly listing
``foo`` as a namespace package. (backport from trunk)

--HG--
branch : setuptools-0.6
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/branches/setuptools-0.6%4053271