no need to first set nullptr

GUI/View/Mask/MaskGraphicsProxy.cpp

@@ -43,11 +43,7 @@ void MaskGraphicsProxy::setIntensityItem(IntensityDataItem* intensityDataItem)
 
 void MaskGraphicsProxy::setSceneAdaptor(SceneAdaptor* sceneAdaptor)
 {
-    if (m_sceneAdaptor)
-        m_sceneAdaptor->setColorMapPlot(nullptr);
-
     m_sceneAdaptor = sceneAdaptor;
-
     if (m_sceneAdaptor)
         m_sceneAdaptor->setColorMapPlot(m_colorMap);
 }