fix "outside area" error occurring when making a flow map with XRSite (which...

fix "outside area" error occurring when making a flow map with XRSite (which fails because local wind at (0,0) is requested

py_wake/site/_site.py

@@ -33,7 +33,7 @@ class LocalWind(xr.Dataset):
         P : array_like
             Probability/weight
         """
-        coords = {'wd': wd, 'ws': ws, }
+        coords = {'wd': wd, 'ws': np.atleast_1d(ws)}
         assert len(np.atleast_1d(x_i)) == len(np.atleast_1d(y_i))
         n_i = max(len(np.atleast_1d(x_i)), len(np.atleast_1d(h_i)))
         coords['i'] = np.arange(n_i)

py_wake/wind_farm_models/wind_farm_model.py

 from abc import abstractmethod, ABC
-from py_wake.site._site import Site
+from py_wake.site._site import Site, UniformSite
 from py_wake.wind_turbines import WindTurbines
 import numpy as np
 from py_wake.flow_map import FlowMap, HorizontalGrid, FlowBox, YZGrid, Grid
@@ -45,7 +45,7 @@ class WindFarmModel(ABC):
         type, h, _ = self.windTurbines.get_defaults(len(x), type, h)
 
         if len(x) == 0:
-            lw = self.site.local_wind(x_i=[0], y_i=[0], h_i=[100], wd=wd, ws=ws)
+            lw = UniformSite([1], 0.1).local_wind(x_i=[0], y_i=[0], h_i=[100], wd=wd, ws=ws)
             z = xr.DataArray(np.zeros((1, len(lw.wd), len(lw.ws))), coords=[('wt', [0]), ('wd', lw.wd), ('ws', lw.ws)])
             return SimulationResult(self, lw, [0], yaw_ilk, z, z, z, z)
         res = self.calc_wt_interaction(x_i=x, y_i=y, h_i=h, type_i=type, yaw_ilk=yaw_ilk, wd=wd, ws=ws)