Fix empty channel issue

lib/channel.js

@@ -466,6 +466,14 @@ Channel.prototype.getIPRank = function (ip, callback) {
  */
 Channel.prototype.preJoin = function (user, password) {
     var self = this;
+
+    // Allow channel to unload if the only user disconnects without finishing a join
+    user.socket.on("disconnect", function () {
+        if (!user.inChannel() && self.users.length === 0) {
+            self.emit("empty");
+        }
+    });
+
     self.whenReady(function () {
         if (self.dead) {
             return;