[Bugs] #3801 TypingTurtle UNSP: User is able to remove all lessons

[Sugar Labs Bugs]

#3801: User is able to remove all lessons
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    Reporter:  humitos                    |          Owner:  wadeb                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  TypingTurtle               |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 Steps to reproduce it:

  1. Open Typing Turtle
  1. Go to Edit Lessons screen
  1. Remove all lessons with the "minus" sign (it's not possible to remove
 the the last one)
  1. Click on "Save lessons to Activity"
  1. Close Typing Turtle
  1. Start a New Instance (by holding Alt)

 Issue:

 Just one lesson is available to play

 Expected issue:

 I think it shouldn't be possible to save the lessons to the Activity .
 This is dangerous because we can break the activity by mistake.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3801>
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