Allow setting output queue before connecting.

Before we connect, the socket will be null. When we then connect
the right output stream will be passed in.

irc/src/main/java/com/dmdirc/parser/irc/IRCParser.java

     public void setOutputQueue(final OutputQueue queue) throws IOException {
         checkNotNull(queue);
         out.clearQueue();
-        queue.setOutputStream(socket.getOutputStream());
+
+        if (socket != null) {
+            queue.setOutputStream(socket.getOutputStream());
+        }
+
         out = queue;
     }