Merge topic 'fix-ospray-module-cmake'

01a12a27 fix initial cmake config

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Robert Maynard <robert.maynard@kitware.com>
Merge-request: !1392

Rendering/OSPRay/module.cmake

 set(optional_test_depends)
-if(${Module_vtkRenderingParallel} AND ${Module_vtkParallelMPI})
+if("${Module_vtkRenderingParallel}" AND "${Module_vtkParallelMPI}")
   set(optional_test_depends "vtkRenderingParallel;vtkParallelMPI")
 endif()