[Bugs] #457 NORM: search for mime_type requires values to be inside an array

[SugarLabs Bugs]

#457: search for mime_type requires values to be inside an array
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    Reporter:  tomeu            |          Owner:  tomeu            
        Type:  defect           |         Status:  new              
    Priority:  Normal           |      Milestone:  0.84             
   Component:  sugar-datastore  |        Version:  Git as of bugdate
    Severity:  Minor            |       Keywords:                   
Distribution:  Unspecified      |   Status_field:  Assigned         
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 But when there's only one value to filter by, it could be directly a
 string.

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Ticket URL: <http://dev.sugarlabs.org/ticket/457>
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