Add test for geographic coords in coord_on_land

Author: luseverin

climada/util/coordinates.py

@@ -648,6 +648,8 @@ def coord_on_land(lat, lon, land_geom=None):
                          % (lat.size, lon.size))
     if lat.size == 0:
         return np.empty((0,), dtype=bool)
+    if not check_if_geo_coords(lat, lon):
+        raise ValueError('Input lat and lon coordinates are not geographic.')
     delta_deg = 1
     lons = lon.copy()
     if land_geom is None: