test_freq_table_nodata raises IndexError on Windows

This test expect that ValueError is raised when calling freq_table with empty arrays, but in my Windows setup IndexError is raised instead. Maybe a numpy version issue?

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ERROR: test_freq_table_nodata (__main__.Test_freq_table)
Test function freq_table with no data.
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Traceback (most recent call last):
  File "test_analysis.py", line 438, in test_freq_table_nodata
    binsize=bs, cutoff=co)
  File "D:\Python27\lib\unittest\case.py", line 471, in assertRaises
    callableObj(*args, **kwargs)
  File "..\wind\analysis.py", line 217, in freq_table
    h[:, 0] += h[:, -1]
IndexError: invalid index

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Numpy version 1.6.1 from PythonXY.