tvtk BitArray returns error with from_array having components, but generates side effect.

I find this behavior a bit suspicious...
```
>>> a=tvtk.BitArray()
>>> a
[]
>>> a.number_of_components
1
>>> a.from_array([(0, 0, 0),(1,1,1)])
ERROR: In /home/vagrant/pisi/tmp/VTK-5.10.1-3/work/VTK5.10.1/Common/vtkDataArray.cxx, line 942
vtkBitArray (0x1e93ec0): Number of tuples in 'from' (2) and 'to' (0) do not match.

ERROR: In /home/vagrant/pisi/tmp/VTK-5.10.1-3/work/VTK5.10.1/Common/vtkDataArray.cxx, line 942
vtkBitArray (0x1e93ec0): Number of tuples in 'from' (2) and 'to' (0) do not match.

ERROR: In /home/vagrant/pisi/tmp/VTK-5.10.1-3/work/VTK5.10.1/Common/vtkDataArray.cxx, line 942
vtkBitArray (0x1e93ec0): Number of tuples in 'from' (2) and 'to' (0) do not match.

>>> a.number_of_components
3
>>> a
[]
>>> a.from_array([(0, 0, 0),(1,1,1)])
>>> a
[(0.0, 0.0, 0.0), (1.0, 1.0, 1.0)]
>>> a.number_of_components
3
```