[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                                
 Keywords:                     |  
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 {{{
 $ python_select -n
 /opt/local/bin/python_select: line 83: [: ==: unary operator expected
 /opt/local/bin/python_select: line 83: [: ==: unary operator expected
 /opt/local/bin/python_select: line 83: [: ==: unary operator expected
 /opt/local/bin/python_select: line 83: [: ==: unary operator expected
 version "" is invalid!
 }}}

 easy fix would be
 {{{
 -                 if [ ${1} == ${version} ]; then
 +                if [ x${1} == x${version} ]; then
 }}}

 might be better to stop script when python_select called with -n only

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