Channel joins with 0 members when not allowed to join

If you join a channel while not identified, or you need to be invited, such as joining `#reddit` on `chat.freenode.net`, the room will "open" with 0 people, and you can even "chat", but error messages will be sent to `chat.freenode.net`'s main channel:



I don't know if this is a bug or not, I am pretty new to IRC. However, it is unintuitive. I would have expected the room to not open, with an error message dialog or something popping up. If nothing else, it would be nice to have a new message indicator on the `chat.freenode.net` label which would alert me to the server trying to tell me this information. On that note, it would help if `chat.freenode.net` was more apparently clickable -- I only learned that I could click on it by mistake.

Start by reproducing the IRC join flow for a channel that requires identification or an invitation, such as #reddit on chat.freenode.net. Trace how the client handles the server's join error and the chat.freenode.net server label; the work is done when denied joins do not open a misleading usable room and the server's error is clearly surfaced.

Written by the indexing model from the issue text.