Fixed that textilize and markdown would instantiate their engines even on empty strings. This also fixes #333 [Ulysses]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@224 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Fixed that textilize and markdown would instantiate their engines even on empty strings. This also fixes #333 [Ulysses]
+
 * Added use of *_before_type_cast for all input and text fields. This is helpful for getting "100,000" back on a integer-based 
   validation where the value would normally be "100".
 

actionpack/lib/action_view/helpers/text_helper.rb

@@ -69,7 +69,7 @@ module ActionView
         # Returns the text with all the Textile codes turned into HTML-tags. 
         # <i>This method is only available if RedCloth can be required</i>.
         def textilize(text)
-          RedCloth.new(text).to_html
+          text.empty? ? "" : RedCloth.new(text).to_html
         end
 
         # Returns the text with all the Textile codes turned into HTML-tags, but without the regular bounding <p> tag. 
@@ -90,7 +90,7 @@ module ActionView
         # Returns the text with all the Markdown codes turned into HTML-tags. 
         # <i>This method is only available if BlueCloth can be required</i>.
         def markdown(text)
-          BlueCloth.new(text).to_html
+          text.empty? ? "" : BlueCloth.new(text).to_html
         end
       rescue LoadError
         # We can't really help what's not there