More detailed error message in log when scm command fails (#1682).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1757 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/scm/adapters/abstract_adapter.rb

@@ -179,7 +179,7 @@ module Redmine
           rescue Errno::ENOENT => e
             msg = strip_credential(e.message)
             # The command failed, log it and re-raise
-            logger.error("SCM command failed: #{strip_credential(cmd)}\n  with: #{msg}")
+            logger.error("SCM command failed, make sure that your SCM binary (eg. svn) is in PATH (#{ENV['PATH']}): #{strip_credential(cmd)}\n  with: #{msg}")
             raise CommandFailed.new(msg)
           end
         end