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ParaViewCatlayst: check for null pipeline before execution

Louis Gombert requested to merge louis.gombert/paraview:catalyst-null-pipeline into master

Using a non existing path as a script in a Catalyst2 node would crash ParaView on execution when there are args to process, after triggering the warning 'WARN| File/path does not exist and not in PYTHONPATH'. We now only trigger the warning, and avoid processing the script args with a null pipeline which causes a crash.

To test: run CxxFullExample/build/bin/CxxFullExampleV2 <non existing file>.py --enable-live

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