fix: handle references to a voice channel that doesnt exist (#660)

naff/models/discord/voice_state.py

@@ -57,21 +57,22 @@ def channel(self) -> "TYPE_VOICE_CHANNEL":
         """The channel the user is connected to."""
         channel: "TYPE_VOICE_CHANNEL" = self._client.cache.get_channel(self._channel_id)
 
-        # make sure the member is showing up as a part of the channel
-        # this is relevant for VoiceStateUpdate.before
-        # noinspection PyProtectedMember
-        if self._member_id not in channel._voice_member_ids:
-            # the list of voice members need to be deepcopied, otherwise the cached obj will be updated
+        if channel:
+            # make sure the member is showing up as a part of the channel
+            # this is relevant for VoiceStateUpdate.before
             # noinspection PyProtectedMember
-            voice_member_ids = copy.deepcopy(channel._voice_member_ids)
-
-            # create a copy of the obj
-            channel = copy.copy(channel)
-            channel._voice_member_ids = voice_member_ids
-
-            # add the member to that list
-            # noinspection PyProtectedMember
-            channel._voice_member_ids.append(self._member_id)
+            if self._member_id not in channel._voice_member_ids:
+                # the list of voice members need to be deepcopied, otherwise the cached obj will be updated
+                # noinspection PyProtectedMember
+                voice_member_ids = copy.deepcopy(channel._voice_member_ids)
+
+                # create a copy of the obj
+                channel = copy.copy(channel)
+                channel._voice_member_ids = voice_member_ids
+
+                # add the member to that list
+                # noinspection PyProtectedMember
+                channel._voice_member_ids.append(self._member_id)
 
         return channel