test_analysis-example1.rb: Double scatterplot: Graph should not even exist

browser/test/functional/test_analysis-example1.rb

@@ -12,7 +12,7 @@ class TestSimple < BrowserTest
   
   def test_00_graph_hidden
 #    assert (not $b.clone_in_graph('0').visible?), "Graph lines should not be visible"
-    assert ($b.graph().style('height')=='0px'), "Graph should be hidden"
+    assert (not $b.graph.exists?), "Graph should not exist"
   end
 
   def test_00_double_scatterplot