[dashboards] unreachable code warnings
On paraview-branch-master-[windows_vs2019_qt]
https://open.cdash.org/viewBuildError.php?type=1&buildid=7115415
C:\glr\builds\paraview\paraview-ci\Remoting\Animation\vtkSMAnimationSceneWebWriter.cxx(117) : warning C4702: unreachable code