[Trac #1465] cannot _update_ an object without a file name

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#1465: cannot _update_ an object without a file name
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 Reporter:  tomeu      |       Owner:  bcsaller 
     Type:  defect     |      Status:  new      
 Priority:  normal     |   Milestone:  Untriaged
Component:  datastore  |     Version:           
 Keywords:             |  
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 The attached patch adds a test for updating an object without a file and
 fixes datastore.py for it to work.

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Ticket URL: <http://dev.laptop.org/ticket/1465>
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