[Paraview] Error handling in a programmable filter.

[Utkarsh Ayachit]

>
> We would like to block the updating of the pipeline upon an error in the
> programmable filter (just like a C++ filter).
>
>
>
Raising an exception in the Python script should a interupt your script,
however from the code I see that that wouln't exactly do what `return 0` in
RequestData for C++ filter would. Please feel to report a bug on the issue
tracker. Should be fairly easy to address in  a future release of ParaView.

Utkarsh
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