[Bugs] #3297 UNSP: voltage block fails on the 1.75

[Sugar Labs Bugs]

#3297: voltage block fails on the 1.75
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    Reporter:  tonyforster                |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Turtleart                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 ta131 xo1.75 os25

 Traceback (most recent call last):
   File "/home/olpc/Activities/TurtleArt.activity/TurtleArt/talogo.py",
 line 482, in doevalstep
     self.step.next()
   File "/home/olpc/Activities/TurtleArt.activity/TurtleArt/talogo.py",
 line 461, in _evalsym
     result = self.cfun.fcn(self, *self.arglist)
   File
 "/home/olpc/Activities/TurtleArt.activity/plugins/audio_sensors/audio_sensors.py",
 line 198, in <lambda>
     'voltage', 0, lambda self: primitive_dictionary['voltage'](0))
   File
 "/home/olpc/Activities/TurtleArt.activity/plugins/audio_sensors/audio_sensors.py",
 line 366, in prim_voltage
     voltage = float(_avg(buf)) * self.voltage_gain + self.voltage_bias
 AttributeError: 'Audio_sensors' object has no attribute 'voltage_gain'

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3297>
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