<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _parse_lobby_chat(self, messages, source, timestamp):
 """Parse a lobby chat message."""

        for message in messages:
            if message.message_length == 0:
                continue
            chat = ChatMessage(message.message, timestamp, self._players(), source=source)
            self._parse_chat(chat)