NPE while processing GlobalRedirect objects

Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: 3.1 RC1
Fix Version/s: 3.2 M1, 3.1.1
Component/s: Old Core
Labels:
None

Difficulty:
Trivial

Similar issues:

~~XWIKI-35~~	getFirstObject raises a NPE if there is a missing object for one of the classes in a document
~~XWIKI-2818~~	NPE during conversion of object to XML
~~XWIKI-2817~~	NPE during conversion of document to XML
~~XWIKI-932~~	NPE during import on some documents
~~XWIKI-5175~~	NPE in XWikiLDAPUtils#isMemberOfGroup cause authentication to fail
~~XWIKI-4427~~	NPE on simple TWIki Syntax
~~XWIKI-459~~	NPE instead of proper exception message
~~XWIKI-4385~~	NPE in XWikiDocument.CopyDocument() introduced by the patch of XWIKI-4283
~~XWIKI-2813~~	Name of object should always be set to the name of their document
~~XWIKI-6896~~	XWikiDocument#getXObject(ObjectReference) throws a NPE when the object reference has no object number

Description

NPE is cause by null object, when the GlobalRedirect objects has been created than deleted.
This issue may cause an entire farm to be broken, since all request is concerned.
Hopefully, this only happen when global redirection is enabled, and it is not by default.