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Fix crash when using VR without any HMD connected

Tiffany Chhim requested to merge tiffany.chhim/paraview:exitVRUponInitFail into master

With OpenVR, ParaView would simply crash due to accessing a nullptr.
With OpenXR, ParaView would enter a looping state where nothing happens until quitting VR.

Proper initialization of the render window is now checked to fix these issues.

Needs vtk/vtk!9176 (merged).

Closes #19688 (closed).

Edited by Tiffany Chhim

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