Move interpolation call

Try block should only have retrieving the function, not its execution

Author: VeckoTheGecko

parcels/field.py

@@ -1241,14 +1241,15 @@ def _interpolator2D(self, ti, z, y, x, particle=None):
         ctx = InterpolationContext2D(self.data, eta, xsi, ti, yi, xi)
 
         try:
-            return interpolator_registry_2d[self.interp_method](ctx)
+            f = interpolator_registry_2d[self.interp_method]
         except KeyError:
             if self.interp_method == "cgrid_velocity":
                 raise RuntimeError(
                     f"{self.name} is a scalar field. cgrid_velocity interpolation method should be used for vector fields (e.g. FieldSet.UV)"
                 )
             else:
                 raise RuntimeError(self.interp_method + " is not implemented for 2D grids")
+        return f(ctx)
 
     @deprecated_made_private  # TODO: Remove 6 months after v3.1.0
     def interpolator3D(self, *_):
@@ -1260,9 +1261,10 @@ def _interpolator3D(self, ti, z, y, x, time, particle=None):
         ctx = InterpolationContext3D(self.data, zeta, eta, xsi, ti, zi, yi, xi, self.gridindexingtype)
 
         try:
-            return interpolator_registry_3d[self.interp_method](ctx)
+            f = interpolator_registry_3d[self.interp_method]
         except KeyError:
             raise RuntimeError(self.interp_method + " is not implemented for 3D grids")
+        return f(ctx)
 
     def temporal_interpolate_fullfield(self, ti, time):
         """Calculate the data of a field between two snapshots using linear interpolation.