test failure in bzrlib.tests.test_multiparent.TestMultiVersionedFile.test_save_load on Python 2.7

[Jelmer Vernooij]

On python 2.7 this test fails for some reason, I haven't been to find out why yet:

running=./bzr selftest --subunit --load-list /tmp/tmp8sh4fm
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ERROR: bzrlib.tests.test_multiparent.TestMultiVersionedFile.test_save_load
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Text attachment: log
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0.887 creating repository in file:///tmp/testbzr-oog7HN.tmp/.bzr/.
0.892 creating branch <bzrlib.branch.BzrBranchFormat7 object at 0x11a0250> in file:///tmp/testbzr-oog7HN.tmp/
0.905 trying to create missing lock '/tmp/testbzr-oog7HN.tmp/.bzr/checkout/dirstate'
0.905 opening working tree '/tmp/testbzr-oog7HN.tmp'
0.926 opening working tree '/tmp/testbzr-oog7HN.tmp'
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Text attachment: traceback
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Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 169, in _run_user
    return fn(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 499, in _run_test_method
    return self._get_test_method()()
  File "/home/jelmer/src/bzr/bzr.dev/bzrlib/tests/test_multiparent.py", line 263, in test_save_load
    self.assertEqual('a\nb\nc\nd', ''.join(newvf.get_line_list(['a'])[0]))
  File "/home/jelmer/src/bzr/bzr.dev/bzrlib/multiparent.py", line 512, in get_line_list
    return [self.cache_version(v) for v in version_ids]
  File "/home/jelmer/src/bzr/bzr.dev/bzrlib/multiparent.py", line 519, in cache_version
    diff = self.get_diff(version_id)
  File "/home/jelmer/src/bzr/bzr.dev/bzrlib/multiparent.py", line 567, in get_diff
    return MultiParent.from_patch(zip_file.read())
  File "/home/jelmer/src/bzr/bzr.dev/bzrlib/multiparent.py", line 192, in from_patch
    return cls._from_patch(StringIO(text))
  File "/home/jelmer/src/bzr/bzr.dev/bzrlib/multiparent.py", line 211, in _from_patch
    hunks[-1].lines[-1] += '\n'
IndexError: list index out of range
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[Martin Packman (gz)]

See the existing bug for background on why this happens.