Restore rev param validation that was removed in r2840.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4542 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/functional/repositories_subversion_controller_test.rb

@@ -166,6 +166,12 @@ class RepositoriesSubversionControllerTest < ActionController::TestCase
                             }
     end
     
+    def test_invalid_revision
+      get :revision, :id => 1, :rev => 'something_weird'
+      assert_response 500
+      assert_error_tag :content => /was not found/
+    end
+    
     def test_revision_with_repository_pointing_to_a_subdirectory
       r = Project.find(1).repository
       # Changes repository url to a subdirectory