Temporary fix for get_forum_topics

Author: SpEcHiDe

pyrogram/methods/chat_topics/get_forum_topics.py

@@ -92,6 +92,9 @@ async def get_forum_topics(
             messages = {}
 
             for message in getattr(r, "messages", []):
+                if isinstance(message, raw.types.MessageEmpty):
+                    continue
+
                 messages[message.id] = await types.Message._parse(
                     self,
                     message,