[Bugs] #4825 Calculate LOW: Non-numerical inputs (excluding constants) only throw errors when they are beside a digit in a mathematical operation when they should throw errors anytime they are typed

[Sugar Labs Bugs]

#4825: Non-numerical inputs (excluding constants) only throw errors when they are
beside a digit in a mathematical operation when they should throw errors
anytime they are typed
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       Reporter:  castelliam  |       Owner:
           Type:  defect      |      Status:  new
       Priority:  Low         |   Milestone:  Unspecified
      Component:  Calculate   |     Version:  Unspecified
       Severity:  Minor       |    Keywords:
Distribution/OS:  Ubuntu      |  Bug Status:  Unconfirmed
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 Typing a letter alone (such as a,b,c,etc.) - other than "e" - in a
 mathematical operation will not produce a result/do anything. But, when we
 place a number beside that letter (say 4c, 8h+5, etc.), this results in a
 parsing error. We think that there should always be an error message that
 appears alerting the user this is not an acceptable input.

 **Refer to pictures below

 Version Details: Using VirtualBox (firmware), Fedora Release 20 Heisenbug
 (Build), Image(Sugar 0.103.2, Ubuntu 64-bit v.14.04.1)
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Ticket URL: <http://bugs.sugarlabs.org/ticket/4825>
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