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VTK Bug15270: Correct empty condition for vtkGlyph3DMapper

Haocheng LIU requested to merge haocheng.liu/vtk:0015270-vtkGlyph3DMapper_GetBounds-wrong into master

When working on an empty polydata, vtkGlyph3DMapper::GetBounds() would return the bounds of the glyph instead of vtkMath::UninitializedBounds. This would be confusing because glyph's bounds has nothing to do with the rest of the scene and discrupts vtkRenderer::ResetCameraClippingRange. To fix this, a check condition is added. If there is nothing inside the scene, we just return the vtkMath::UninitializedBounds.

Fixes #15270 (closed)

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