code: def merge_extinfo(host, extinfo):
          
          # Note that 2d_coords and 3d_coords are never merged, so not usable !
          properties = ['notes', 'notes_url', 'icon_image', 'icon_image_alt',
                        'vrml_image', 'statusmap_image']
          # host properties have precedence over hostextinfo properties
          for prop in properties:
              if getattr(host, prop) == '' and getattr(extinfo, prop) != '':
                  setattr(host, prop, getattr(extinfo, prop))
docs: Merge extended host information into a host
  
          :param host: the host to edit
          :type host: alignak.objects.host.Host
          :param extinfo: the external info we get data from
          :type extinfo: alignak.objects.hostextinfo.HostExtInfo
          :return: None