redirect_delete_warning
No security coverage
This module provides warning messages when an editor is about to delete a node or term that has redirects pointed to it.
Features
Adds a warning if a node or term that is being redirected to is being threatened with deletion; that's basically it.
Post-Installation
Simply install and enable the module, no configuration should be necessary.
Additional Requirements
Requires the redirect module.
Similar projects
I do not know of any modules that provide solely this functionality.