It needs not to be visible for the user. Additional we would avoid the possibility that the user removes the node which lead to weired effects.
Of course it would be nice to cover even this case in the Live Wire Tool
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[c1126a]: Merge branch 'bug-16096-WorkingContourNode'
Merged commits:
2013-12-04 17:00:49 Daniel Knorr [4184d6]
Set Property of the ContourModelNode to "helper object: true"