Send an error message when a user tries to destroy the room without being present in the room.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@10056 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/openfire/muc/spi/LocalMUCUser.java

@@ -345,8 +345,7 @@ public class LocalMUCUser implements MUCUser {
         else {
             MUCRole role = roles.get(group);
             if (role == null) {
-                // TODO: send error message to user (can't send packets to group you haven't
-                // joined)
+                sendErrorPacket(packet, PacketError.Condition.not_authorized);
             }
             else if (IQ.Type.result == packet.getType()) {
                 // Only process IQ result packet if it's a private packet sent to another