Override default_render's behavior with a block
In 0de4a23d the behavior when there is a missing template was changed to not raise an error, but instead head :no_content. This is a breaking change and some gems rely on this happening. To allow gems and other code to work around this, allow `default_render` to take a block which, if provided, will execute the contents of that block instead of doing the `head :no_content`.
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