Allow components to subscribe to nodes

src/java/org/jivesoftware/openfire/pubsub/PubSubEngine.java

@@ -543,7 +543,7 @@ public class PubSubEngine {
             return;
         }
         // Check if the subscriber is an anonymous user
-        if (!UserManager.getInstance().isRegisteredUser(subscriberJID)) {
+        if (!UserManager.getInstance().isRegisteredUser(subscriberJID) && !isComponent(subscriberJID)) {
             // Anonymous users cannot subscribe to the node. Return forbidden error
             sendErrorPacket(iq, PacketError.Condition.forbidden, null);
             return;