NPE while deleting an attachment from a renamed page
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                 Key: JSPWIKI-299
                 URL: https://issues.apache.org/jira/browse/JSPWIKI-299
             Project: JSPWiki
          Issue Type: Bug
          Components: Core & storage
    Affects Versions: 2.7.x
         Environment: JSPWiki 2.7.0-svn-49
            Reporter: Harry Metske
            Priority: Minor


If you try to delete an attachment from a page that has been renamed, you will 
get the following NPE:

Error Message
    An unknown exception java.lang.NullPointerException was caught by Error.jsp.
Exception
    java.lang.NullPointerException
Place where detected
    
com.ecyrd.jspwiki.providers.CachingAttachmentProvider$CachedAttachmentCollector.cacheEntryRemoved(),
 line 459

patch is attached (an extra NPE check) 

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