VTK Bug15270: Correct empty condition for vtkGlyph3DMapper
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 and a new test file is included.
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