Preview web content does not work with CKEditor

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X
• Fix Version/s: 7.1.10 DXP FP12, 7.1.X
• Component/s: Web Content > Web Content Administration
• Labels:
  • QA-V
  • ee-7.1.x-only
  • ee-ts
  • liferay-fixpack-dxp-12-7110
• Branch Version/s:
  7.1.x
• Backported to Branch:
  Committed
• Story Points: 0.25
• Fix Priority: 3
• Git Pull Request: https://github.com/dacousalr/liferay-portal-ee/pull/92

Reproduction Steps:

1. Set up a latest master and add to the portal-ext.properties the following property then start it:

editor.wysiwyg.portal-impl.portlet.ddm.text_html.ftl=ckeditor

2. Go to Content --> Web Content and create a basic web content.

3. Click on the 3 dots beside the content and select "Edit"

4. Change the content and leave the Summary empty then click on "Preview" from the upper right 3 dots.

Actual Behavior: Error appears: web content is temporarily unavailable. NullPointerException in the logs.

Expected Behavior: A pop up window should appear with the option to save the new content and after saving it, the preview of the edited content appears.

7.1.x @ cc834f237de2d6e0b223e973f5d3f35349eb5c37

Master @ bcca1cda3713d8a75b7bfb0ddd7503d9efcdab5b

Note: On 7.1.x there's no error. However, the ckeditor field seems to be insensitive to changes: preview shows the old version of the text, without asking whether to save it as a draft. Works correctly when e.g. Summary is changed.