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Viewing changes to src/maasserver/models/signals/tests/test_nodes.py

[r=blake-rouse][bug=][author=allenap] In the node_type_change_notify trigger, explicitly do nothing when a node is converted to or from a chassis.

There are some related drive-by fixes and simplifications too.

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Lines of Context:
src/maasserver/models/signals/tests/test_nodes.py
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        chassis = factory.make_Node(node_type=NODE_TYPE.CHASSIS)
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        chassis.node_type = NODE_TYPE.DEVICE
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        chassis.save()
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        error = None
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        try:
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            reload_object(chassis).chassis_hints
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        except ChassisHints.DoesNotExist as exc:
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            error = exc
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        self.assertIsNotNone(error)
 
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        self.assertRaises(
 
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            ChassisHints.DoesNotExist,
 
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            lambda: chassis.chassis_hints)