[vtkusers] vtkAppendPolyData bug

[David Doria]

>> By make sure the filter code can handle no cells, is that covered by
>> "just make sure all tests still pass"? Or did you have some certain
>> demo in mind that I'd need to perform?
>
> I'm suggesting a new test that e.g. creates a polydata with 10 points
> and 10 cells, and one that just contains 10 points, append them, check
> if the resulting polydata has 20 points and 10 cells.
>
> Jeff
>

The demo seems to work fine:

polydata1
There are 2 points.
There are 2 cells.

polydata2
There are 2 points.
There are 0 cells.

Combined
There are 4 points.
There are 2 cells.

Thanks,

David