Fixed NPE when trying to load a vCard of a non-existent user. JM-889

git-svn-id: http://svn.igniterealtime.org/svn/repos/wildfire/branches@5917 b35dd754-fafc-0310-a699-88a17e54d16e

3_1_branch/src/java/org/jivesoftware/wildfire/ldap/LdapVCardProvider.java

@@ -130,7 +130,7 @@ public class LdapVCardProvider implements VCardProvider, PropertyEventListener {
     private Map<String, String> getLdapAttributes(String username) {
         // Un-escape username
         username = JID.unescapeNode(username);
-        HashMap<String, String> map = new HashMap<String, String>();
+        Map<String, String> map = new HashMap<String, String>();
 
         DirContext ctx = null;
         try {
@@ -156,7 +156,7 @@ public class LdapVCardProvider implements VCardProvider, PropertyEventListener {
         }
         catch (Exception e) {
             Log.error(e);
-            return null;
+            return Collections.emptyMap();
         }
         finally {
             try {