JavaScript exception thrown when creating a page from a link within an AWM app

Follow these steps to reproduce:

• go to an AWM app that has a Large Text (TextArea) or Content property. You can use the Movies app from the Help Center
• Edit an application entry and add a link to a page that doesn't exist (you can do this simply by selecting a word, click on the link toolbar button and then OK to close the link dialog)
• save the page
• from view mode click on the link to the missing page
• a popup appears asking you to select a template for the page
• try to select various templates

A JavaScript error is thrown when you select a template. This may cause https://forum.xwiki.org/t/create-child-page-from-awm-can-only-choose-one-same-type/6349 , but from my experiments, the error didn't prevent me from creating the page.