access to strided scalar array crash in DummySPH

[jfavre]

Using the VTKmAdaptor (vkm-2.2), or using the Ascent adaptor (vtkm-2.1), with for example
s3:
plots:
p1:
type: "pseudocolor"
field: "Pressure"
points:
radius: 0.01

[jfavre]

https://github.com/Alpine-DAV/ascent/blob/develop/src/tests/ascent/t_ascent_vtkh_data_adapter.cpp is the closest test I can find