[MacPorts] #14452: python_select produce unneeded warnings when the only option is "-n"

[MacPorts]

#14452: python_select produce unneeded warnings when the only option is "-n"
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  Reporter:  ebgssth at gmail.com  |       Owner:  macports-tickets at lists.macosforge.org
      Type:  enhancement        |      Status:  new                                  
  Priority:  Normal             |   Milestone:  Port Enhancements                    
 Component:  ports              |     Version:  1.6.0                                
Resolution:                     |    Keywords:                                       
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Comment (by ebgssth at gmail.com):

 attached a patch for this.
 also added -e option to sh so that any error causes script stop

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/14452#comment:1>
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