[Bugs] #3489 UNSP: Do not fail if sugar session was never started

[Sugar Labs Bugs]

#3489: Do not fail if sugar session was never started
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    Reporter:  alsroot                    |          Owner:  alsroot                    
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-server-kit           |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 If stats functionality enabled, it tries to connect to stats server using
 SSH key generated by Sugar. If Sugar session was never started, it can't
 find SSH key.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3489>
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