[Bugs] #2154 UNSP: Sugar dies upon launching an activity

[Sugar Labs Bugs]

#2154: Sugar dies upon launching an activity
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    Reporter:  bernie                     |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  0.88.x                     
    Severity:  Unspecified                |       Keywords:  dextrose                   
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by tomeu):

 Replying to [comment:5 bernie]:
 > Replying to [comment:4 tomeu]:
 > > We seem to ask for the properties of a buddy that is not on the bus
 any more. Should be relatively harmless.
 >
 > Ok. We shouldn't trap the exception to avoid printing a backtrace?

 We should listen in the bus so we know when that name is not available any
 more and update our model. Which is what Aleksey did for the activities.

 > How about this other error?
 >
 > {{{
 > 1281528213.766399 ERROR root: set_active() failed:
 org.freedesktop.DBus.Error.NoReply: Message did not receive a reply
 (timeout by message bus)
 > }}}

 This is what Aleksey fixed in #2064.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2154#comment:6>
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