[MacPorts] #17635: upgrade_sources_conf_default.tcl script needs svn with file:/// sources via svn

[MacPorts]

#17635: upgrade_sources_conf_default.tcl script needs svn with file:/// sources via
svn
-------------------------------+--------------------------------------------
  Reporter:  blb@…             |       Owner:  blb@…           
      Type:  defect            |      Status:  closed          
  Priority:  Normal            |   Milestone:  MacPorts 1.7.1  
 Component:  base              |     Version:  1.7.0           
Resolution:  fixed             |    Keywords:                  
      Port:                    |  
-------------------------------+--------------------------------------------
Changes (by blb@…):

  * status:  new => closed
  * version:  1.6.0 => 1.7.0
  * resolution:  => fixed


Comment:

 Updated in r46983, by ignoring an svn-based repo when {{{svn}}} isn't
 found, it will cause the puts at the end to point out how to manually
 update sources.conf.

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Ticket URL: <http://trac.macports.org/ticket/17635#comment:2>
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