Fixed DarcsAdapter for ruby 1.9.3.

Unlike 1.8 and 1.9.2, Entries#compact returns an Array with 1.9.3, instead of an Entries object, resulting in a "undefined method `sort_by_name'" error.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9051 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/scm/adapters/darcs_adapter.rb

@@ -100,7 +100,8 @@ module Redmine
             end
           end
           return nil if $? && $?.exitstatus != 0
-          entries.compact.sort_by_name
+          entries.compact!
+          entries.sort_by_name
         end
 
         def revisions(path=nil, identifier_from=nil, identifier_to=nil, options={})