I noticed that the catalyst_execute returns a catalyst_status_ok even if a pipeline execute fails.
Is there any plan in future, to return an error code when ExecutePipelines fails ?
I was thinking of returning a false if the ExecutePipelines fails and catch it in catalyst_execute_paraview.
it makes sense for me too to return an error if the pipeline failed, AFAIK there is no plan to improve that so feel free to change that if you can 
FYI @nicolas.vuaille @caitlin.ross @Andy_Bauer
I agree that it make sense to handle vtkInSituInitializationHelper::ExecutePipelines(params) return value in catalyst_execute().