I'm getting this error in my visualizations. Should I open a bug entry?
DNU: ROMondrianViewBuilder >> container...

To reproduce: execute the following code in a freshly downloaded moose image, trigger the visualization by right-clicking on a number and selecting the menu item....
| browser |
	browser := GLMTabulator withStatusbar.
	browser column: #one; column: #two.
	browser transmit to: #one; andShow: [ :a |
		a list 
			title: 'Select and trigger from menu';
			display: [:x | 1 to: x ];
			selectionAct: [:list | 
				| value |
				value := list selection * 10. "simulate some custom setup"
				(list pane port: #customSelection) value: value ] 
			entitled:  'Multiply by 10 and then send outside'
			].
	browser transmit to: #two; from: #one port: #customSelection; andShow: [ :a |
		a roassal 
			title: 'Numbers in Roassal';
			painting: [:view :number | 
				view shape label.
				view nodes: (1 to: number).
				view edgesFrom: [:each | each // 5 ].
				view treeLayout.
				ROEaselMorphic new populateMenuOn: view.
				  ]].
	browser openOn: 42