Initialize ExternalComponent with empty strings.

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@2901 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/messenger/component/ComponentSession.java

 /**
- * $RCSfile$
+ * $RCSfile: ComponentSession.java,v $
  * $Revision$
  * $Date$
  *
@@ -221,9 +221,9 @@ public class ComponentSession extends Session {
      */
     public class ExternalComponent implements Component {
 
-        private String name;
-        private String type;
-        private String category;
+        private String name = "";
+        private String type = "";
+        private String category = "";
         private String subdomain;
 
         public void processPacket(Packet packet) {