[BUG] test suite does not run properly on python 2.3

[Aaron Bentley]

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$ python2.3 bzr selftest
bzr: (<module 'bzrlib.tree' from
'/mnt/reiser/abentley/arch2/bzr.mpool3/bzrlib/tree.pyc'>, 'has no tests')
  at /usr/lib/python2.3/doctest.py:1346 in DocTestSuite()
  see ~/.bzr.log for debug information
abentley at bruiser:~/arch/bzr.mpool3$ python2.3 bzr selftest
bzr: (<module 'bzrlib.tree' from
'/mnt/reiser/abentley/arch2/bzr.mpool3/bzrlib/tree.pyc'>, 'has no tests')
  at /usr/lib/python2.3/doctest.py:1346 in DocTestSuite()
  see ~/.bzr.log for debug information

It would seem that the 2.3 version of unittest requires the modules to
have tests.

Patch attached.

Aaron
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