storage: properly handle unknown channels on get_channel

litecord/storage.py

@@ -532,6 +532,9 @@ class Storage:
     async def get_channel(self, channel_id: int, **kwargs) -> Optional[Dict[str, Any]]:
         """Fetch a single channel's information."""
         chan_type = await self.get_chan_type(channel_id)
+        if chan_type is None:
+            return None
+
         ctype = ChannelType(chan_type)
 
         if ctype in (