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Fix crash in vtkSMProxySelectionModel

Timothée Couble requested to merge timothee.couble/paraview:fix_delete_select_pipeline_browser_crash into master

Check associated port proxy exist before accessing it in vtkSMProxySelectionModel.cxx

How to reproduce the crash:

  • Build Examples/CustomApplications/Clone1 (could not reproduce with paraview)
  • Open two source with at least 2 output port (e.g m4_TotalDensity.cube vtk dataset)
  • Delete one of the source by deleting one of it's output port (e.g Molecule for the cube dataset)
  • Click on the other source

Backport: release

Edited by Timothée Couble

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