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Fix windows crash when starting trace.

Aron Helser requested to merge aron.helser/paraview:fix_windows_trace_crash into master

On windows, if you don't start ParaView with a working directory that's the same as the bin directory, python modules won't import. This causes vtkSMTrace::StartTrace() to fail and return nullptr. Check for this return so we print error messages, and don't segfault.

cc @demarle

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