[Cuis-dev] [Fix] Small fixes to SystemWindow

[Nicolás Papagna Maldonado]

Hi folks!

While investigating the SystemWindow hierarchy, I found that the
#open:label message sends #buildMorphicWindow but that method is not
defined on the instance side.
This signals a MNU error instead of a subclass responsibility one.

I also extracted #toOpen: from #open:label: because I didn't find a way to
create a properly initialized SystemWindow (model + the call to
#buildMorphicWindow) without
opening it in the world.

The attached changeset addresses both.

Cheers,
Nico
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