FEVER_DEMAND_CURVE_FOR_COUPLE seems broken

[mabijkerk]

When I run the FEVER_PRODUCTION_CURVE_FOR_COUPLE, I get expected results:

FEVER_PRODUCTION_CURVE_FOR_COUPLE(
  V(households_space_heater_combined_network_gas),
  V(households_useful_demand_for_space_heating_terraced_houses_1965_1984)
)

[
  941.3148533148487,
  ...,
  1,068.1549289644927,
]

However, when I run the FEVER_DEMAND_CURVE_FOR_COUPLE, I get an error:

private method `demand_curve_for' called for #<Qernel::FeverFacade::ConsumerAdapter node=households_useful_demand_for_space_heating_terraced_houses_1965_1984>

        consumer.demand_curve_for(producer).to_a
                ^^^^^^^^^^^^^^^^^
Did you mean?  demand_curve_from_activities

This is unexpected since they seem virtually the same function. It has low priority though, because we do not seem to use this GQL in any gqueries at the moment.

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