When hitting "Cancel' in inline mode and the document doesn't exist yet, the user should be sent back to the previous page

Right now, when an user uses a form to create a new document and then cancels his action, he is presented with a message saying "This document does not exist". Let's take the following example:

• User goes to the Blog.WebHome page
• User inputs a post title and clicks on create
• User clicks on cancel
• The user is presented with a page saying "This document doesn't exist"

-> the user should be sent back to the page where he came from instead of being left on an unhelpful page.