vtkOSPRayMaterialLibrar error prints

This error is showing in the 5.9.0 release, without OSPRay turned on. 5.9.0 release, paraview.org download client, Linux, remote server.

Showing up client side, after connecting to the server.

(  14.440s) [paraview        ]vtkOSPRayMaterialLibrar:280    ERR| vtkOSPRayMaterialLibrary (0x152b6dd0): JSON parsing error: * Line 1, Column 1
  Syntax error: value, object or array expected.


ERROR: In /builds/gitlab-kitware-sciviz-ci/build/superbuild/paraview/src/VTK/Rendering/RayTracing/vtkOSPRayMaterialLibrary.cxx, line 280
vtkOSPRayMaterialLibrary (0x152b6dd0): JSON parsing error: * Line 1, Column 1
  Syntax error: value, object or array expected.

Note that I CANNOT hide this one from users.

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