[Bugs] #1317 UNSP: check for Rainbow binaries before trying to use them

[SugarLabs Bugs]

#1317: check for Rainbow binaries before trying to use them
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    Reporter:  sascha_silbe               |          Owner:  sascha_silbe     
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar                      |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  Assigned         
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 Jonas Smedegaard on sugar-devel:

 > It seems to me that the code currently does not check if rainbow is
 installed, only if some rainbow config space exist - which seems wrong to
 me.

 and:

 > If that is correct, then I recommend changing that to instead test for
 the existence of some binary, as the Debian packaging system (and most
 probably other packaging systems as well) preserve configuration files
 when removing a package.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1317>
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