Nobody else will see it, so I wouldn't really pay attention to it.
I don't think that there is a way for you to remove it completely, but if there was, the only difference it would make is that you wouldn't see the "this entry has been deleted" message. Everybody else already doesn't see it on other peoples pages, so if you could completely delete it, it would only be removing that message from your view.
Somebody more familiar with Blogs will be able to confirm if this is true, so wait until somebody else responds so you know for sure.
Edit: ^ That already happened while I was typing out my response.