Meatball-surgery fix for invalid-name bug.

Meatball-surgery fix for invalid-name bug.

00:07:27   AI0867 | esr: it reproduces on git head                   │
00:07:42   AI0867 | ./irk irc://chat.freendoe.net/foo                │
00:07:45   AI0867 | that's sufficient                                │
00:08:01      esr | OK, please email me a description of how to      │
                  | reproduce, I'll fix it.                          │
00:08:39      esr | Oh.  Is therec anything special about that       │
                  | channel?                                         │
00:08:42   AI0867 | no                                               │
00:08:48   AI0867 | any incorrect servername will do                 │
00:08:56   AI0867 | it then attempts to quit the server              │
00:09:01   AI0867 | and tries to send a QUIT                         │
00:09:06   AI0867 | which throws an exception                        │
00:09:10   AI0867 | so it tries to quit the server                   │