Fix missing nullptr initialization

source/RobotAPI/gui-plugins/ArViz/LayerInfoTree.h

@@ -111,7 +111,7 @@ namespace armarx
 
     private:
 
-        QTreeWidget* widget;
+        QTreeWidget* widget = nullptr;
         /// Connections to the current widget.
         QVector<QMetaObject::Connection> widgetConnections;