[Bugs] #4180 Chart UNSP: Chart: hangs if a value is 0

[Sugar Labs Bugs]

#4180: Chart: hangs if a value is 0
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    Reporter:  manuq                      |          Owner:  manuq      
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  Chart                      |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:             
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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 After the user adds a 0,0 entry, no more entries can be added or removed.
 Trace:

 {{{
 1352485165.024774 INFO chart-activity: Change "0.0" to "0.0"
 Traceback (most recent call last):
   File "/home/olpc/Activities/Chart.activity/activity.py", line 373, in
 _remove_value
     value = self.labels_and_values.remove_selected_value()
   File "/home/olpc/Activities/Chart.activity/activity.py", line 714, in
 remove_selected_value
     value = (self.model.get(iter, 0)[0], float(self.model.get(iter,
 1)[0]))
 ValueError: invalid literal for float(): 0,0
 }}}

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4180>
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