problem related to showOnly in Glamour

> I think I have stumbled upon a problem in Glamour. When selecting an entity that is in the model but not shown in the Tree presentation, there is a DNU when setting the selection port to the entity. To reproduce the problem:
>
> - execute the following script in Moose then right click and select "select in tree" on a number not displayed in the Tree presentation.
>
> The problem might arise due to the fact that all model entities do not have their morph nodes when using showOnly option. Can you please have a look?
>  
>
> | browser items |
> browser := GLMTabulator withStatusbar.
> items := 50.
> browser column: #one; column: #two.
>
> browser transmit to: #one; andShow: [ :a |
> (a tree)
> title: 'Tree';
> showOnly: 30;
> display: [:each | 1 to: items];
> children: [ :item :x :level | level > 1
> ifTrue: [ #() ]
> ifFalse: [ 1 to: item ]]].
>
> browser transmit to: #two; from: #one; andShow: [ :a |
> a mondrian
> title: 'Numbers in Mondrian list';
> painting: [:view :number |
> view shape rectangle width: 20; text: #printString; withoutBorder.
> view interaction
> item: 'Select in tree' action: [:each | ((browser paneNamed: #one) port:#selection) value:each ].
> view nodes: (1 to: 40).
> view gridLayout.
> ]
> ].
> browser openOn: 1
>
> tx,
> Usman
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