Do not check for a valid const name in Rails 3.0 applications. [#4200 state:resolved]

railties/lib/rails/tasks/framework.rake

@@ -41,7 +41,8 @@ namespace :rails do
         require 'rails/generators/rails/app/app_generator'
         gen = Rails::Generators::AppGenerator.new ["rails"], { :with_dispatchers => true },
                                                              :destination_root => Rails.root
-        gen.send(:valid_app_const?)
+        File.exists?(Rails.root.join("config", "application.rb")) ?
+          gen.send(:app_const) : gen.send(:valid_app_const?)
         gen
       end
     end