Log internal server errors in LocalMUCUser.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@10034 b35dd754-fafc-0310-a699-88a17e54d16e

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

@@ -402,6 +402,7 @@ public class LocalMUCUser implements MUCUser {
                     }
                     catch (Exception e) {
                         sendErrorPacket(packet, PacketError.Condition.internal_server_error);
+                        Log.error(e);
                     }
                 }
             }