plugin misc_room_game, radiocol, tarot: fixes bridge method "prepareRoom" declaration (add "async=True")

src/plugins/plugin_misc_room_game.py

@@ -407,7 +407,7 @@ class RoomGame(object):
         profile = self.host.memory.getProfileName(profile_key)
         if not profile:
             log.error(_("Unknown profile"))
-            return
+            return defer.succeed(None)
         if other_players is None:
             other_players = []
 
@@ -419,11 +419,11 @@ class RoomGame(object):
         if room_jid_s is not None and room_jid_s != "":  # a room name has been specified
             if room_jid_s in self.host.plugins["XEP-0045"].clients[profile].joined_rooms:
                 roomJoined(self.host.plugins["XEP-0045"].clients[profile].joined_rooms[room_jid_s])
-                return
+                return defer.succeed(None)
         else:
             room_jid_s = self.getUniqueName(profile_key=profile_key)
             if room_jid_s == "":
-                return
+                return defer.succeed(None)
         user_jid = self.host.getJidNStream(profile)[0]
         d = self.host.plugins["XEP-0045"].join(JID(room_jid_s), user_jid.user, {}, profile)
         return d.addCallback(roomJoined)