Show explicit error message when the scm command failed (eg. when svn binary is not available).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1094 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/scm/adapters/abstract_adapter.rb

@@ -120,7 +120,7 @@ module Redmine
           rescue Errno::ENOENT => e
             # The command failed, log it and re-raise
             logger.error("SCM command failed: #{cmd}\n  with: #{e.message}")
-            raise CommandFailed
+            raise CommandFailed.new(e.message)
           end
         end  
       end

lib/redmine/scm/adapters/subversion_adapter.rb

@@ -66,7 +66,6 @@ module Redmine
           entries = Entries.new
           cmd = "#{SVN_BIN} list --xml #{target(path)}@#{identifier}"
           cmd << credentials_string
-          cmd << " 2>&1"
           shellout(cmd) do |io|
             output = io.read
             begin