[Bugs] #1446 UNSP: Calculator error should be more readable, better error parsing should be implemented

[Sugar Labs Bugs]

#1446: Calculator error should be more readable, better error parsing should be
implemented
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    Reporter:  mvadkert                   |          Owner:  rwh                        
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Calculate                  |        Version:  Unspecified                
    Severity:  Major                      |       Keywords:                             
Distribution:  Fedora                     |   Status_field:  Unconfirmed                
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 Description of problem:
 If you start calculator activity and hit several times Enter, you get an
 error:

 Error at 0: Parse error

 Version-Release number of selected component (if applicable):
 0.85.4-1

 How reproducible:
 always

 Steps to Reproduce:
 1. start calculator activity
 2. hit Enter button several times
 3. observe output

 Actual results:
 Error at 0: Parse error

 Expected results:
 No error, blank screen.

 Additional info:
 Also the input filtering could be better, try to enter a very long number
 and
 hit Enter -> the screen gets mixed up. See attached screenshot.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1446>
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