I'm not 100% familiar with the issue this is solving here, but the code looks OK.
Remove links from recent actions widget in admin dashboard
Review Request #2957 — Created March 13, 2012 and submitted
When allowing extensions to have their own admin sites, broken links are generated by this list under special circumstances. This is due to a bug in Django; an issue has been filed at https://code.djangoproject.com/ticket/17726. Until a custom admin log is written, or a better solution is found, the links will be removed altogether. This change should have been a part of /r/2954/
Tested in local dev.