add WD_ilk to WT arguments and fix optional_input when None

py_wake/wind_farm_models/engineering_models.py

@@ -752,6 +752,7 @@ class All2AllIterative(EngineeringWindFarmModel):
         diff_lk = np.zeros((L, K))
         diff_lk_last = None
         dw_iilk, hcw_iilk, dh_iilk = self.site.distance(wd_l=wd, WD_ilk=WD_ilk)
+        kwargs['WD_ilk'] = WD_ilk
 
         wt_kwargs = self.get_wt_kwargs(TI_eff_ilk, kwargs)
         ct_ilk = self.windTurbines.ct(ws=WS_ILK, **wt_kwargs)

py_wake/wind_turbines/wind_turbine_functions.py

@@ -153,7 +153,7 @@ class FunctionSurrogates(WindTurbineFunction, ABC):
         if input_keys[0] == 'self':
             input_keys = input_keys[1:]
         defaults = inspect.getfullargspec(self.get_input).defaults
-        optional_inputs = input_keys[1:] if defaults is None else input_keys[::-1][:len(defaults)]
+        optional_inputs = [] if defaults is None else input_keys[::-1][:len(defaults)]
 
         if output_keys is None:
             output_keys = [fs.output_names[0] for fs in self.function_surrogate_lst]