Documents are created when adding an image from the wysiwyg, even if cancel button is clicked

Step to reproduce:

• Create an application that contains a textarea (with WYSIWYG)
• Create a new document
• Add an image using the WYSIWYG
• Cancel the creation of your document

Your document has been created but without any objects. If you edit it, it's a standard wiki document.
The document should not have been created, or cancel button should delete it in this specific case.