Add warning log for invalid response in Twitch.py

Log a warning when the response from load_channel_points_context is invalid, instead of raising an exception.

TwitchChannelPointsMiner/classes/Twitch.py

@@ -674,7 +674,8 @@ class Twitch(object):
         response = self.post_gql_request(json_data)
         if response != {}:
             if "data" not in response or response["data"] is None:
-                raise StreamerDoesNotExistException
+                logger.warning(f"Invalid response from load_channel_points_context for {streamer.username}: {response}")
+                return
             if response["data"]["community"] is None:
                 raise StreamerDoesNotExistException
             channel = response["data"]["community"]["channel"]