add blank line

Author: gabrielaznar

climada/entity/exposures/base.py

@@ -367,6 +367,7 @@ def plot_basemap(self, mask=None, ignore_zero=False, pop_name=True,
             url (str, optional): image source, e.g. ctx.sources.OSM_C
             kwargs (optional): arguments for scatter matplotlib function, e.g.
                 cmap='Greys'. Default: 'Wistia'
+
          Returns:
             matplotlib.figure.Figure, cartopy.mpl.geoaxes.GeoAxesSubplot
         """