When a user creates a page and doesn´t access to preview it, the first user/editor that access to preview recieved a notification:

 'There are pending changes by {0}. Please reload the page.'

Steps to reproduce (demoauthor):

1. Login as eric and create a page (without access to preview).
2. Login as superuser.
3. Preview that previous page (created by eric). Notification messages displayed: There are pending changes by eric. Please reload the page."

It seems to be related to the fact that the page was not previously rendered. The root cause seems to be similar to: https://jira.magnolia-cms.com/browse/MGNLSLOCK-38

Update in 2016/12/01: This issue doesn't occur when previewing the page, but when opening the page instead.