code: def get_existing_keyword(self, keyword):
          
          if self.existing_keywords is None:
              return {}
          if keyword is not None:
              return self.existing_keywords.get(keyword, {})
          else:
              return {}
docs: Obtain an existing keyword's value.
  
          :param keyword: A keyword from keywords.
          :type keyword: str
  
          :returns: The value of the keyword.
          :rtype: str, QUrl