pyrofork: filters: topic: Add support for general topic

Signed-off-by: wulan17 <wulan17@nusantararom.org>

Author: wulan17

pyrogram/filters.py

@@ -1081,6 +1081,7 @@ class topic(Filter, set):
     Parameters:
         topics (``int`` | ``list``):
             Pass one or more topic ids to filter messages in specific topics.
+            Pass 1 for general topic.
             Defaults to None (no topics).
     """
 
@@ -1092,4 +1093,6 @@ def __init__(self, topics: Union[int, List[int]] = None):
         )
 
     async def __call__(self, _, message: Message):
+        if message.is_topic_message and not message.topic:
+            return 1 in self
         return message.topic and message.topic.id in self