[Bugs] #2959 UNSP: Do not fail if NetworkManager is absent

[Sugar Labs Bugs]

#2959: Do not fail if NetworkManager is absent
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    Reporter:  alsroot                    |          Owner:                             
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Git as of bugdate          
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Description changed by alsroot:

Old description:



New description:

 |TastCase|
 * in NM less environment, open Network page in Control Panel

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2959#comment:1>
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