HTML safety: fix textarea with nil content

actionpack/lib/action_view/helpers/form_tag_helper.rb

@@ -265,7 +265,7 @@ def text_area_tag(name, content = nil, options = {})
         escape = options.key?("escape") ? options.delete("escape") : true
         content = html_escape(content) if escape
 
-        content_tag :textarea, content.html_safe, { "name" => name, "id" => sanitize_to_id(name) }.update(options.stringify_keys)
+        content_tag :textarea, content.to_s.html_safe, { "name" => name, "id" => sanitize_to_id(name) }.update(options.stringify_keys)
       end
 
       # Creates a check box form input tag.

actionpack/test/template/form_tag_helper_test.rb

@@ -176,6 +176,12 @@ def test_text_area_tag_unescaped_content
     assert_dom_equal expected, actual
   end
 
+  def test_text_area_tag_unescaped_nil_content
+    actual = text_area_tag "body", nil, :escape => false
+    expected = %(<textarea id="body" name="body"></textarea>)
+    assert_dom_equal expected, actual
+  end
+
   def test_text_field_tag
     actual = text_field_tag "title", "Hello!"
     expected = %(<input id="title" name="title" type="text" value="Hello!" />)