DrawingLinesAsTube : fix crash when no lights
When drawingLinesAsTube, vertexVCVSOutput is needed in the geometry shader. Add a condition in ReplaceShaderPositionVC to pass the vertex position in case of DrawingLinesAsTube
When drawingLinesAsTube, vertexVCVSOutput is needed in the geometry shader. Add a condition in ReplaceShaderPositionVC to pass the vertex position in case of DrawingLinesAsTube