SVN itself prints out information like this
svn: warning: Error handling externals definition for 'C:\QBW\4130\aggregator\plugins\com.lgc.dsp':
svn: warning: URL '
http://src.example.com/svn/dsp-branches/feature1 at revision 26170 doesn't exist
When the URL of an svn:external is invalid, but returns a successful error code. I would like an option to fail the checkout on this output.