Getting default scaler and default initializer broken for scaler state blocks

[dallan-keylogic]

When trying to test the scaler object for the Helmholtz properties, I encountered the following error:

    @pytest.mark.unit
    def test_scaler_object_mole_basis():
        m = pyo.ConcreteModel()
        m.fs = FlowsheetBlock()

        m.fs.prop_water = HelmholtzParameterBlock(
            pure_component="h2o", amount_basis=AmountBasis.MOLE
        )

        m.fs.sb = m.fs.prop_water.build_state_block()

>       assert m.fs.sb.default_scaler is hstate.HelmholtzEoSScaler

tests\test_stateblock.py:52:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
..\..\..\core\base\property_base.py:602: in default_scaler
    return self.parent_component().default_scaler
..\..\..\core\base\property_base.py:602: in default_scaler
    return self.parent_component().default_scaler
E   RecursionError: maximum recursion depth exceeded while calling a Python object
!!! Recursion detected (same locals & position)

The problem here is that m.fs.sb.parent_component() is m.fs.sb because it is a scalar block. We have been attaching default_scaler and default_initializer attributes to the StateBlock instead of the StateBlockData children:

class _StateBlock(StateBlock):
    """
    This class contains methods which should be applied to Property Blocks as a
    whole, rather than individual elements of indexed Property Blocks.
    """

    # Set default initializer
    default_initializer = HelmholtzEoSInitializer
    default_scaler = HelmholtzEoSScaler

but evidentially that isn't sufficient.