Merged V2.2 to HEAD

8146: Interim checkin for Oracle upgrade scripts.
   8150: AR-1905
   8151: AR-1956
   8152: Correct I18N when reporting patch description
   8153: QName script for Oracle along with fixes for unique constraints on assoc tables
   8155: Upgrade scripts for Oracle V2.2 - almost there
   8164: AWC-1633: Unable to edit rule added via web service
   8166: V2.2 upgrade scripts for MySQL and Oracle
   8170: AWC-1515: E-mail doesn't reach user's mail box, if it was created with the help of templates
   8174: Fix for AWC-798
   8180: Fix for AWC-1843
   8183: Fixes for different unique index names on alf_child_assoc
   8189: AWC-1719: Need to alllow Rules to account for a space being deleted
   8249: Fixed handling of empty namespaces on Oracle
   8259: Fixes for null namespaces in QName
   8360: Modified alf_audit_date columns and added patch
   8404: Fix AR-2133: Fix handling of empty namespaces during upgrade


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@8481 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/app/servlet/AuthenticationHelper.java

@@ -169,7 +169,7 @@ public final class AuthenticationHelper
                   NodeRef guestHomeRef = (NodeRef)nodeService.getProperty(guestRef, ContentModel.PROP_HOMEFOLDER);
                   
                   // check that the home space node exists - else Guest cannot proceed
-                  if (nodeService.exists(guestHomeRef) == false)
+                  if (guestHomeRef == null || nodeService.exists(guestHomeRef) == false)
                   {
                      // cannot login as Guest as Home is missing - return to login screen
                      logger.warn("Unable to locate Guest Home space - may have been deleted?");