[Regression] Switching from xpage to a normal page with the right side panel open does not display the right message

Steps to reproduce:

1. Go to HAP channel
2. Select the Experience page menu item
3. From page actions select Page -> Content
4. Select the Blog menu item

Expected result:

Right side panel shows a message No page content or version history available for this page.

Actual result:

The document has some invalid pending changes. See also Jenkins failure in comment