Make sure xml_simple requests don't blow up if an empty request body is recieved

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3936 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_controller/cgi_ext/cgi_methods.rb

@@ -63,11 +63,12 @@ class CGIMethods #:nodoc:
         when Proc
           strategy.call(raw_post_data)
         when :xml_simple
-          typecast_xml_value(XmlSimple.xml_in(raw_post_data,
-            'forcearray'   => false,
-            'forcecontent' => true,
-            'keeproot'     => true,
-            'contentkey'   => '__content__'))
+          raw_post_data.blank? ? nil :
+            typecast_xml_value(XmlSimple.xml_in(raw_post_data,
+              'forcearray'   => false,
+              'forcecontent' => true,
+              'keeproot'     => true,
+              'contentkey'   => '__content__'))
         when :yaml
           YAML.load(raw_post_data)
         when :xml_node

actionpack/test/controller/webservice_test.rb

@@ -92,6 +92,12 @@ class WebServiceTest < Test::Unit::TestCase
     assert_equal 'content...', @controller.params["summary"]
     assert_equal 'SimpleXml', @controller.params["title"]
   end
+
+  def test_use_xml_ximple_with_empty_request
+    ActionController::Base.param_parsers[Mime::XML] = :xml_simple
+    assert_nothing_raised { process('POST', 'application/xml', "") }
+    assert_equal "", @controller.response.body
+  end
   
   def test_deprecated_request_methods
     process('POST', 'application/x-yaml')