[Bugs] #4119 GraphPlotter NORM: Errors when there are expressions in the list

[Sugar Labs Bugs]

#4119: Errors when there are expressions in the list
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    Reporter:  danielfrancis  |          Owner:  danielfrancis    
        Type:  defect         |         Status:  new              
    Priority:  Normal         |      Milestone:                   
   Component:  GraphPlotter   |        Version:  Git as of bugdate
    Severity:  Major          |       Keywords:                   
Distribution:  Unspecified    |   Status_field:  New              
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 There's to remove this error from the log. I'm thinking in disable the
 option of remove the function when there's only one expression in the
 list.

 Traceback (most recent call last):
  File "/home/alan/Activities/GraphPlotter.activity/canvas.py", line
 340, in _remove_function
    self.functions_list.remove_function()
  File "/home/alan/Activities/GraphPlotter.activity/functions.py", line
 132, in remove_function
    _iter = self.model.get_iter(rows[1][0])
 IndexError: list index out of range

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4119>
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