Merge pull request #9366 from killthekitten/fix-content_for-regression

Fix for #9360 content_for regression

actionpack/CHANGELOG.md

@@ -1041,4 +1041,6 @@
 *   `ActionView::Helpers::TextHelper#highlight` now defaults to the
     HTML5 `mark` element. *Brian Cardarella*
 
+*   Fixed `ActionView::Helpers::CaptureHelper#content_for` regression (described in #9360). *Nikolay Shebanov*
+
 Please check [3-2-stable](https://github.com/rails/rails/blob/3-2-stable/actionpack/CHANGELOG.md) for previous changes.

actionpack/lib/action_view/helpers/capture_helper.rb

@@ -156,7 +156,7 @@ def content_for(name, content = nil, options = {}, &block)
           end
           nil
         else
-          @view_flow.get(name)
+          @view_flow.get(name).presence
         end
       end
 

actionpack/test/template/capture_helper_test.rb

@@ -137,6 +137,10 @@ def test_content_for_returns_nil_when_writing
     assert_equal 'bar', content_for(:title)
   end
 
+  def test_content_for_returns_nil_when_content_missing
+    assert_equal nil, content_for(:some_missing_key)
+  end
+
   def test_content_for_question_mark
     assert ! content_for?(:title)
     content_for :title, 'title'