Recurring errors for page created from a deleted template wiki

Steps to reproduce:

• created a wiki "mytemplate" with both local and global users
• mark it as a template from its descriptor page
• create a local user "XWiki.LocalUser"
• create a page inside the template wiki with the XWiki.LocalUser (e.g., Sandbox.testpage.WebHome)
• create a wiki "testwiki2" using this template
• delete the template wiki
• access the page on the remaining wiki (e.g. testwiki2:Sandbox.testpage.WebHome, http://localhost:8080/xwiki/wiki/testwiki2/view/Sandbox/testpage/)

Result:

• the logs print recurring errors concerning the missing user and wiki