code: def get_message(self, msglevels=None, joiner=None):
          
          messages = []
          if joiner is None:
              joiner = ', '
          if msglevels is None:
              msglevels = [OK, WARNING, CRITICAL]
          for result in self._results:
              if result.code in msglevels:
                  messages.append(result.message)
          return joiner.join([msg for msg in messages if msg])
docs: the final message for mult-checks
  
          arguments:
              msglevels: an array of all desired levels (ex: [CRITICAL, WARNING])
              joiner: string used to join all messages (default: ', ')
  
          returns:
              one-line message created with input results
              or None if there are none