Fix regression with unresolved channels due to reordering.

Channels are meant to fallback to Object if the message is out of
order. Somewhere along the commit line this got removed despite the
issue still existing.

discord/state.py

@@ -47,6 +47,7 @@ from .role import Role
 from .enums import ChannelType, try_enum, Status, Enum
 from . import utils
 from .embeds import Embed
+from .object import Object
 
 class ListenerType(Enum):
     chunk = 0
@@ -260,15 +261,16 @@ class ConnectionState:
             yield self.receive_chunk(guild.id)
 
     def _get_guild_channel(self, data):
+        channel_id = int(data['channel_id'])
         try:
             guild = self._get_guild(int(data['guild_id']))
         except KeyError:
-            channel = self.get_channel(int(data['channel_id']))
+            channel = self.get_channel(channel_id)
             guild = None
         else:
-            channel = guild and guild.get_channel(int(data['channel_id']))
+            channel = guild and guild.get_channel(channel_id)
 
-        return channel, guild
+        return channel or Object(id=channel_id), guild
 
     async def request_offline_members(self, guilds):
         # get all the chunks