fix issues with previous 2 commits

Author: softwareengineerprogrammer

src/geophires_x/Economics.py

@@ -3852,8 +3852,9 @@ def _calculate_derived_outputs(self, model: Model) -> None:
                 .to(convertible_unit(self.chp_percent_cost_allocation_for_electrical_plant.CurrentUnits)).magnitude
             )
 
-        self.surface_equipment_costs_total.value = (self.Cplant.quantity() + self.Cgath.quantity()).to(
-            self.surface_equipment_costs_total.CurrentUnits).magnitude
+        if all(hasattr(self, it) for it in ['Cplant', 'Cgath']):
+            self.surface_equipment_costs_total.value = (self.Cplant.quantity() + self.Cgath.quantity()).to(
+                self.surface_equipment_costs_total.CurrentUnits).magnitude
 
 
     @property

src/geophires_x/Outputs.py

@@ -499,7 +499,7 @@ def PrintOutputs(self, model: Model):
                     if model.surfaceplant.plant_type.value == PlantType.ABSORPTION_CHILLER:
                         f.write(f'            of which Absorption Chiller Cost:           {econ.chillercapex.value:10.2f} {econ.chillercapex.CurrentUnits.value}\n')
                     if model.surfaceplant.plant_type.value == PlantType.HEAT_PUMP:
-                        f.write(f'            of which Heat Pump Cost:                    {econ.heatpumpcapex.value:10.2f} {econ.Cplant.heatpumpcapex.value}\n')
+                        f.write(f'            of which Heat Pump Cost:                    {econ.heatpumpcapex.value:10.2f} {econ.heatpumpcapex.CurrentUnits.value}\n')
                     if model.surfaceplant.plant_type.value == PlantType.DISTRICT_HEATING:
                         f.write(f'            of which Peaking Boiler Cost:               {econ.peakingboilercost.value:10.2f} {econ.peakingboilercost.CurrentUnits.value}\n')