code: def map_title(self):
          
          # noinspection PyBroadException
          try:
              title = self._keyword_io.read_keywords(
                  self.impact, 'map_title')
              return title
          except KeywordNotFoundError:
              return None
          except Exception:  # pylint: disable=broad-except
              return None
docs: Get the map title from the layer keywords if possible.
  
          :returns: None on error, otherwise the title.
          :rtype: None, str