The WebPreferences of incomplete pages are published

Steps to reproduce:

• Create a configuration
• Check "Publish only "Complete" pages"
• Create pages to publish
• Before publishing, make sure you have a page with "Draft" status
• Make sure the Draft has a corresponding WebPreference page created
• And a page with "Complete" status 
• Publish

Expected results:

Only the page with the "Complete" status is published. The WebPreferences stays under the draft location.

Actual results:

Both pages with "Complete" status and the WebPreferences of the other page are published. As a result, the page that wasn't moved under the new location (the "draft" page) is displayed as an empty node in the breadcrumbs and navigation.