NPE thrown during Harvest of non-items when visibility restriction is enabled
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                 Key: DS-212
                 URL: http://jira.dspace.org/jira/browse/DS-212
             Project: DSpace 1.x
          Issue Type: Bug
          Components: DSpace API
         Environment: 
http://localhost:8080/oai/request?verb=ListIdentifiers&metadataPrefix=oai_dc
            Reporter: Stuart Lewis
             Fix For: 1.6.0
         Attachments: null-items.patch

When the visibility restriction is enabled (e.g. harvest.includerestricted.oai 
= false) a null pointer exception is thrown when items are harvested, but the 
'item' is not set as part of the harvest.

This occurs when ListIdentifiers is being run via OAI-PMH as the item need not 
be set, only the information (id) about the item is needed. The code tries to 
see if the item has ANON READ permissions, but the item is not set, resulting 
in an NPE.

Patch attached.

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