[Bugs] #4471 Browse UNSP: Can't close saved pdf in re-opened browse session

[Sugar Labs Bugs]

#4471: Can't close saved pdf in re-opened browse session
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    Reporter:  carrott                    |          Owner:  manuq                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Browse                     |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 13.2.0 Build 1, XO-4, Browse 149.1

 Open Browse[[BR]]
 Navigate to a PDF such as [[BR]]
 Click save to journal[[BR]]
 Close Browse[[BR]]
 Reopen Browse[[BR]]
 Observe that PDF tab cannot be closed and the below error in the log[[BR]]

 {{{
 Traceback (most recent call last):
   File "/home/olpc/Activities/Browse.activity/browser.py", line 307, in
 __tab_close_cb
     tab_page.cancel_download()
   File "/home/olpc/Activities/Browse.activity/pdfviewer.py", line 415, in
 cancel_download
     self._download.cancel()
 AttributeError: 'PDFTabPage' object has no attribute '_download'
 }}}

 This doesn't happen if you do not save the pdf to the journal or you close
 the pdf tab before closing browse.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4471>
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