Only Benchmark and log if we're going to output the information.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8136 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_view/partials.rb

@@ -112,7 +112,7 @@ def render_partial(partial_path, object_assigns = nil, local_assigns = nil) #:no
           add_counter_to_local_assigns!(partial_name, local_assigns)
           add_object_to_local_assigns!(partial_name, local_assigns, object)
 
-          if logger
+          if logger && logger.debug?
             ActionController::Base.benchmark("Rendered #{path}/_#{partial_name}", Logger::DEBUG, false) do
               render("#{path}/_#{partial_name}", local_assigns)
             end