OWScatterPlot: Do not show messages when data is removed

Author: VesnaT

Orange/widgets/visualize/owscatterplot.py

@@ -294,6 +294,7 @@ def reset_graph_data(self, *_):
         self.update_graph()
 
     def set_data(self, data):
+        self.clear_messages()
         self.Information.sampled_sql.clear()
         self.__timer.stop()
         self.sampling.setVisible(False)