[Bugs] #1431 UNSP: sugar-jhbuild silently fails if lsb_release is not found

[Sugar Labs Bugs]

#1431: sugar-jhbuild silently fails if lsb_release is not found
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    Reporter:  Samus_                     |          Owner:  sascha_silbe               
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-jhbuild              |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 currently if the lsb_release tool is not present the script fails to
 recognize dependencies but does not let the user know that the tool is
 missing.

 proposed patch emits a warning.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1431>
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