test_partially_invalid_plot_data: AssertionError: TypeError not raised (python3.3, ubuntu 13.04 amd64)
```
======================================================================
FAIL: test_partially_invalid_plot_data (pandas.tests.test_graphics.TestDataFramePlots)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/buildd/pandas-0.13.0/debian/tmp/usr/lib/python3/dist-packages/pandas/tests/test_graphics.py", line 939, in test_partially_invalid_plot_data
    df.plot(kind=kind)
  File "/tmp/buildd/pandas-0.13.0/debian/tmp/usr/lib/python3/dist-packages/pandas/util/testing.py", line 1331, in __exit__
    raise AssertionError("{0} not raised.".format(name))
AssertionError: TypeError not raised.

----------------------------------------------------------------------
Ran 4317 tests in 380.425s

FAILED (SKIP=325, failures=1)
['Idx']
```

seems to be just a sporadic failure (did test ok before in the same environment,  ok on i386 in this round of builds), full log http://neuro.debian.net/_files/_buildlogs/pandas/0.13.0/pandas_0.13.0-1~nd13.04+1_amd64.build
